I found this online:
To remove your name from telemarketing lists, write to:
Telephone Preference Service
c/o Direct Marketing Association
P.O. Box 9014
Farmingdale, NY 11735-9014
Or call 1-888-382-1222 (TTY - 1-866-290-4236) to register your telephone or cell phone number on the national Do-Not-Call Registry. (You must call from the telephone or cell phone number you wish to register.) You may also register or obtain additional information via the Internet at
www.donotcall.gov.
Never give out your credit card numbers or other personal information to someone who calls and asks for them. Report companies using questionable telemarketing practices to the State Attorney General or the Better Business Bureau.