You probably did not ask them to take you off their list. You may have said you were not interested or hung up, but if you do not specifically ask to be taken off a list, I am told that telemarketers can keep calling you.
Same thing as above. The worst decision I have made recently is to seek information from the University of Phoenix. I have screamed at them to take me off their call list and they do not. Isn't there some place to report these people to.