The problem with tracking telemarketers' phone numbers is that there isn't much you can do with the information. There are many sites that will tell you generally that other people are being bothered by the same numbers, and possibly even some that will tell you who the numbers belong to, but without legislation to prevent such calls, letting them know you have a live number and a human to answer the call, by complaining, is just going to generate more of the same, or worse.
As long as people have listed or otherwise published phone numbers, or have numbers that a sequential dialer-bot might use (as in, everybody), the calls will keep coming. You can decrease the calls by not answering or hanging up right away.
As long as people have listed or otherwise published phone numbers, or have numbers that a sequential dialer-bot might use (as in, everybody), the calls will keep coming. You can decrease the calls by not answering or hanging up right away.