I simply don't answer.  It isn't as if they are knocking on my door.  If it is important they will leave a message with return number.  Telemarketing is annoying and sadly the only way some people can earn a living.  I add the number to my phone book as a do not answer if they call several times.  Too many scams out there.  

My info was sold to them by a medical malpractice lawyer after I opted not to hire them for my suit.

Someone with a very thick Indian accent named "Rick" or "Rex" called.  I could not understand a word he said.  I asked for a manager or someone who spoke English.  He said something I could not make out and hung up on me.  

I've found the best way to handle this type of call is to hand the phone to my 5-year-old and tell her it's Santa on the other end :-)

Just received a call from this number, didn't recognized the number   therefore, I didn't speak with anyone.

Called me at six AM and very loud obnoxious voice!!! Not interested! Nice feature on the IPhone is BLOCK CALL

They called.. I answered, dead air then click.  Thanks for the heads up Diane - If they call back I plan on Slowing down my speech and tttelling them I am a Ssstrokkkke  victim.  I find that doing this I can maximize the amount of their time I can waste. It's jolly good fun too!  Try to get them to ask you questions and be painfully Ssssss.....low ..............in.........Annnn.....sering.
If you can suck them in  - then the best revenge is to give them a good HAHA! at the end.
Do Not.  I repeat...  Do Not hold back!  These people bother the elderly, the sick, and our hard working brothers and sisters.  My number is on the do not call list so I if they call me, they are already breaking the law.  Remind them of what a loser they are - working in a phone room for peanuts and then try to denigrate their heritage if they haven't hung up on you yet.  
Whatever racial or demographic slur you can work in before they hang up on you the better.  Remember - Nothing is out of bounds.  

The guy claims to be from "Medical Services Department". I hung up, so I didn't hear anything more.

My husband got a call from them asking for me.  Hung up on them.

Called use a great deal of profanity when I said I was not interested in speaking to him.

Received countless calls from: 956.876.3322.  I asked to be taken off the calling list and the person was very rude and hung up on me.  I tried to call back, but received a busy signal each time.  

Got a call, rang twice, they hung up. No message was left, tried to call back and it wouldn't go through.

I keep getting calls from this number for someone besides me.  I ask them every time to remove this number from their list, but within a day or two I get a call from them again.  I have no idea who they are or what they want.  

I have been receiving calls from this number and I have told them time and time again that I don't want there HELP