Rather than being hostile, play along with the telemarketer. Instead of wasting one minute of their time, waste 10 minutes or more. Of course, don't give out any real information. Make it up. Stall. Delay. Chat it up with the telemarketer. If we all do this, their costs go up (they pay for the phone call) and their profits go down.

Try to give out another phone number for them to call. Give them a number that charges a premium by the minute, like a psychic reading number, or even better, one of the Caribbean island scam numbers that don't start with 900.
Try one of these; (476) 456-1946, (767) 275-9072, (268) 762-0159.

Take a 5 quest survey and get a free stock investment newsletter. Very easily confused person calling. Poor sod.

OK THIS IS CREDIT CARD SERVICES WITH A NEW TRICK! YOU PUSH 1 & YOU GET TO BECOME THE 45 CALLER IN LINE. ... THESE GUYS GET PAID FOR EVERY TIME THE CALL COMPLETES. THEY DO NOT CARE IF YOU SAY ANYTHING MORE THAN "HELLO"  OR YOUR vm ANSWERS. IF THEY CAN GET YOUR PERSONAL INFORMATION THE BETTER.  AGAIN I SAY IF THE GOV. CANNOT STOP THEM --- MAYBE A "GOOD" LAWYER CAN!

Got a rasher of calls today - 3.21.2014  --  So far they are 424-580-5423,  201-243-3402,  213-503-5121,  561-672-3679,  323-558-5887,  Are these terrorists?  No way to stop them.  DNC list is worthless,  phone co. can't help..

Caller ID = Survey
"This is the 2nd & final call about your credit card...."