Cardmember Services they just won't quit calling even when I tell them to quit and that I am on the federal do not call list Miami?, Florida

I have had more than 150 calls from Credit Card Services over the past year, which is a prerecorded voice called "Rachel".  They offer to reduce the interest rate on my credit cards to as low as 6%.

I have pressed the number 3 which they say to press if I don't want to keep getting these calls.  I have called the number to call to complain that they are calling when I am on the federal do not call list and they are prohibited from calling.  They still keep calling, no matter what I do to shut them off.

I have seen links on the web that they calls are just scams, but nothing seems to be done to stop them.  I haven't bought into their line about lowering my interest rate, because why would I deal with a company that shows they don't comply with the law when they violate the do not call list, but I don't know how to get them to stop calling.  If nothing else, they should be sued for harassment.