I received a call again today from a company called Encore Receivable Management, Inc. out of Olathe, KS. They have my Good Year credit card account. They claim they have sent me a letter, however, I have received nothing. I was told today they have no control over the mail and a collection letter was sent. She became very rude and said well you're problem if you didn't get it - good luck and hung up. What should I do not?