These marketing scams seem to be using a whole bunch of numbers to reaching people.  Will not leave message on my answering machine.
I have blocked all of them and reported all to DNC list complaint section.
(702)705-5236
(209)220-2357
(458)201-0467
(425)320-5132
(425)320-5163

criminals are now added  to PRO call blocker version 2.0...the best $59 you will ever spend.
1200 number blocking capacity..up to 10 area codes can be blocked...also you can block criminals with no phone numbers on their caller ID.
blockers with 50 or 60 number capacity..you will run out of numbers in a couple of months.
FCC is in bed with these criminals:
1-do not answer the calls that you do not recognize.
2-search on awesome websites such as this one,for the phone number and once you see the numbers here,
3-stop wasting your time with useless reports and complaints and buy a good blocker.

They called again today. No message left.

you can waste your time with filing useless reports or buy a call blocker....search for phone blocker..the one i have,has 1500 number blocking capacity..dont buy phones or blockers with 50 or 60 number capacity..you will run out of numbers in a couple of months.
These criminals will not stop calling..so do yourself a favor and buy a blocker.

And another hangup call today at 2:21 pm today.

Robo-dialer, no human on line, disconnected.

My blocker just hung up on these morons again...no filing useless reports with FCC..buy a blocker and get even.

No ID, no message.  Reported (again) and blocked.  Morons.

702-705-5236 called me last week, I answered it's air duct cleaning, I told them I live in an apartment & to stop calling me.  I then reported them to the DO NOT CALL LIST.  Today they called again. CALL ID says: LAS VEGAS, NV  but I did not answer.  So no message was left.  REPORT THEM, EVERY TIME THEY CALL YOU!

Awesome..you gonna love that blocker..I have the T Lock Version 2.0,I think they are very similar..I have had it 4 months and love..congrats.

They called again and again, their call was blocked by my Panasonic phone.

I have a Panasonic home phone and a Uniden desk phone for my office.  Both phones have the ability to block phone numbers.  Unfortunately, both phones have inadequate capacity as far blocking telemarketers - Uniden (20 numbers) - Panasonic (30 numbers).  
Yesterday, I received a Digitone call blocker - ordered thru Amazon.  I hooked it to my business line and within hours, two telemarketers were blocked.  I am now thinking that I should get a 2nd Digitone for my home line.  I am still learning about this call blocker but, I understand that entire area codes can be blocked and 702 and Washington state will be the first blocked.

Got the recording from "Amanda" for air duct cleaning.  Hung Up.  I live in Orange County, CA.  If they are really in Nevada how ridiculous is that?  (702-705-5236).

another hang up. I love when I can hear CLICK after the machine picks it up.

They called.  I didn't answer.  They didn't leave message.  Will be blocked.

They've called multiple times in past week when I'm at work. Didn't leave message. Based on comments, i won't pick up or return their call. I'm on the do not call list so maybe I'll report them as a violation. These telemarketers can rot in h*ll for all I care.

called x 2 today

These morons called my house and woke me from a sound and much needed rest. Do they imagine for a second I'd hire them to do work in our properties? NEVER losers, find another sucker. This one isn't biting.

There is no end to creeps and scum that crawl out from under rocks.  Put this scamster back under a rock; don't answer and don't buy anything from them.

Started out a recording...I kept pressing all different #'s and a live person came on the line. I said sure I'd like my air ducts cleaned! I asked the name of Company he said Quality Air located in Las Vegas. I asked how they got my # he said it's random and they can't dial as many as the computer. I asked then what are you going to do about removing me from your list especially since I am ON THE DO NOT CALL LIST? He said "We do this..." and pressed and held a # on his keypad loud in my ear then hung up!
Caller ID said LAS VEGAS, NEVADA

How many time do I have to report these tele numbers when my number is listed on the national do not call list.  This is getting ridiculous!

My blocker hung up on these idiots again....I love it.

Got the call from 702-705-5236.  1pm
I couldn't resist: I pressed "1" to speak to someone. (I shouldn't have answered the unknown phone number, but it was a pretty boring afternoon).  A young female voice answered. She asked me if I needed air duct service. I responded by asking the name of the company.  She (reluctantly) answered "Air Quality".  I then asked what city the company was in.  Her response was to hang up on me. Damn. I was just about to hire her and her unlicensed/uninsured/unbonded band of thieves.

These scamming criminals called at 12:51PM, didn't answer, and, as usual, they left no message.  Will report.  Thanks to all for the info.  This "air duct cleaning" scam has been going on for years.  I wish them lots of jail time, with a phone that never stops ringing, just out of reach.

They called again and again their call was blocked.  They have called for 4 months!''

They called again today. Thankfully I was on the phone and didn't answer it.

Thanks 8000notes.com!!!!

Called me today @ 2:20pm.  Didn't recognize number, didn't answer, they didn't leave a message.  CallerID said LAS VEGAS NV.

Adding them to the block list.

The company always calls asking if I need air duct cleaning.  They always call about 2pm to 3pm.  I have asked them to take me off their call list but they continue to call at least twice a week.

Another call from these morons.  They hung up as soon as my machine got to the part in the message where it says that we don't talk to telemarketers!

Already blocked this number, but they keep trying.

I zapped the call.I then called back. It said if you do not want further promotions and to be placed on the do not call hit No.1. If they call back again with a differedt No. I will report it to the FTC.
I am like one report, why is someone in Vegas working is So Cal??