Who Called Us

They have called 3 times today!!! I AM on the "do not call list"!!! None of them could hardly speak English!!! I have ask them NOT to call, I have yelled at them and cussed them out!!
I CALL THEIR NUMBER BACK AND IT IS NO LONGER IN SERVICE!!!

THE CALLER SAID THEY WERE FROM AMERICAN SERVICING AND THAT THEY COULD REDUCE THE INTEREST RATE ON MY CREDIT CARDS. THIS IS A SCAM! DO NOT LISTEN..THEY WILL TAKE YOUR MONEY AND DO NOTHING...THEY GO AFTER YOUR CREDIT CARD INFORMATION!

Asked for me by name. Asked how I was and I told him I was sick with pneumonia, which is true. Said was calling about my "credit card debt". I asked what debt was that and he said he was not allowed to say. I asked if I owe HIM and accused him of cold call trolling and that my number was on the Do Not Call Registry and I was going to turn him in. He said he would harass me and that he hoped I would die.
He called back immediately 2 times, which I ignored.