The most effective method for shutting telemarketers up instantly and never having them call you back are 12 magic words:
"I'm not interested. Please put me on your do not call list".
It is a federal law for them NOT to honor this request. If they call you after you tell them this they will be fined big time. The FTC makes them keep record. It really works. We used to get two or three calls a night from telemarketes. After doing this for about a year we're down to maybe one a month.
Here is some more information:
Telemarketing Sales Rule
I keep getting a recorded message on my machine about an important business message and then they leave an 800 number for me to call. How do I get them to put me on their do not call list without calling their 800 number?
Anyone else getting this type of call?