WCA Subscriber Services is a scam company that actually started online before going to the phones.  These people go to great lengths to steal your phone number from legitimate business sites (say, your insurance or medical bills, etc.) so they can call you to try to either pick you clean with "ads" or steal your identity.
WCA actually calls from several different area codes/numbers, and it's usually an automated call, so you rarely get to actually talk to someone.  The one time that I was able, I threatened him with the BBB (Better Business Bureau) and their local FBI-FU (Federal Bureau of Investigation - Fraud Unit) if I wasn't given all of the information I wanted:
How did you get my unlisted number?
Who is in charge of stealing phone numbers from other businesses?
What is your full name?
What is your manager's full name?
What actual city and state are you calling from?
Why does WCA have 20 different area codes?
And will you testify that WCA is a legitimate business that doesn't steal information in court?

They'll try to interrupt while your asking these questions, but don't give them time.  Rattle the questions off like a telemarketer does, not giving your victim time to think.
You could actually call the BBB and/or call/email the FBI (although contacting the FBI is not to be taken lightly, don't call just because someone won't stop calling.  only if you think your identity is in crisis), but usually just threatening unknown telemarketers with them is enough.

Never,  N  E  V  E  R   choose a menu option (from WCA) just to see what its about, or in hopes of talking to someone.  99% of the time, this is just a way for WCA to "sell" your number to even more unwanted businesses.  This is how they make their money.  They don't ever actually gain money from your wallet.  Other businesses will pay them for your number just for the off-chance that some sucker will answer the phone.   And 7 out of 10 of these "businesses" are just turning around and doing the same thing WCA is.

These are multi-million dollar "companies" that are making money from other companies just because they were smart enough to find a way to steal your phone number/email address.

Of course, all of us who are 30 - 50 yrs old can thank our parents for giving that woman at the store their info just to make them go away.  Remember that from childhood?  An in-your-face lady would approach your parents (or you, if you looked close to legal age) and talk them to death into filling out a survey or a "chance" card.  And they'd actually do it.
How many of these businesses run by 30 - 50 year old hackers do you think spawned from these seemingly innocent surveys?      ...   roughly 85%     ...   thanks, mom and dad.

they just called me, no clue who this is, didn't answer, no voice mail either.

unwantd call

Cals from this number are not wanted

almost daily calls on my business cell. Am getting incredibly fed up. How can I stop those clowns that are wasting my time?

They never leave a message, ever

Seriously?  I went to the ftc complaint addy that was posted above.  After filling out personal information it asks what kind of call it was (w/a drop down box to choose telemarketer).  Next page asks if they are in violation of sending recorded messages-otherwise know as robocalls-I clicked yes.  It directed me right back to the donotcall complaint page, where I have entered complaints about these idiots for the past several months,  They obviously do nothing cuz I'm still getting calls every day.  Idiots.

THIS time the recording said you can sue company(s) if you have taken the following birth control drugs.  I hung up before the list started since this IS an unregistered pay per minute cell phone it does cost me per minute.  Only reason I answered was to tell them to stop calling.  I'm sick of them.  I'm gonna complain to that fcc email addy that complain posted above.

925-281-5147 calls regularly - very annoying. Good thing I don't get charged per call on my mobile.

They call and leave a voice mail daily.  They are currently shilling for a scumbag layer recruiting folks to a lawsuit over a drug (Prodaxa?).

SPAM

file your compliant here:
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2

Hello!! This is WCA Calling.. with a Dental Plan that is affordable .. blah blah blah blah blah blah blah..

Nice try, shill. More idiots from this criminal organization trying to trick folks into going to their scammer website. Nobody subscribes to your crap, and nobody gets unsubscribed.

Help shut these crooks down. Complain here:  https://ftccomplaintassistant.gov

They call my landline all the time!  I just found out who it is!  Sort of...I called it back with a blocked number and a recording said, "Welcome to WCA subscriber services..." and then said they don't accept calls from a blocked number!  and to call back on another line or unblock my number.  Ha, not gonna do that.

So then I looked up WCA Subscriber Services and there are a few but I think it's this one, although it could be a different one:

"WCA operates the Special Offer Service, a unique subscription-based program that rewards consumers for consenting to receive recorded messages that include special product offers and purchase incentives.  Subscribing consumers are automatically entered into a daily cash sweepstakes whenever they answer one of our calls and thousands of dollars have already been awarded. For more information about the SOS, please visit: www.specialofferservice.com

The SOS program was created in order to comply with state and federal regulations that govern the transmission of automated voice messages, and WCA is committed to making it a positive experience for all subscribers.

This website is intended as a resource for subscribers and non-subscribers alike to learn more about WCA and its policies, and the steps they can take to protect themselves from unscrupulous telemarketers, and to secure their privacy online."

I, too, don't answer a # that I don't recognize....

Calls every few days, somewhere out of Antioch Ca. No message.

Calls daily, did not leave message

http://www.whycall.me/925-281-5147.html

Just got a call this morning. If I don't recogonize the number, I don't answer. Screw'um

Keeps calling. How do they call when we signed up for do not call list?? Get calls everyday & just hit ignore button. Going on for months.

same thing - answered, no one replied.