The other way is to report them:
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2
http://www.consumerfinance.gov/complaint/

I have started to use these tele-market phone numbers to play the four number daily lottery.  No luck yet but close.  Example 1678 or 5579 @ 4-exact for $1.  Payoffs usually range $4,800 to $7,200.  One way to handle these foolish calls.

I know no one in this area so I called the # back - it said "press 1 if you are interested in our current promotion press 2 if you would like to be removed from our list"  I pressed 2 to see what company it really was and another voice came on saying "the current promotion was closed" and it hung up on me! Obviously some sketchy here!

Called a few minutes ago. Caller ID said "CDS". I didn't answer.

Robo call at 11:00am so I hung up.  They call back at 12:40 pm and hung up on me.

Got an unsolicited call from Tel:  678-606-5579.  All of these unwanted calls lately, make me think that what they are really after is a Celebrity autograph from me.  Sorry, but no dice.

Please put me on your "DO NOT CALL" list.

Called today.....  Lower interest rate on credit card to 1.99% .... Right

called me

robocall

Your Complaint Has Been Accepted

Thank you for filing your complaint with the National Do Not Call Registry.

Called me, I answered, no one there, hung up.

junk call. they didn't leave a message. bothersome.

Robocall uner the name CDS with sales garbage from some insurance scamming dirtbag.

No message left

Got call today....April 15th.  Did not pickup.

Probable robocall. Called, I answered, no voice, silence for 5 secs, then they hung up on me.