AOL Time Warner free trial offer turns into unauthorized charges deceptive company Internet

AOL offered a free year of service with the purchase of my computer. Within the first few weeks of service, I found the quality so poor, I stopped using AOL. At the end of my free trial period I requested in writing that my service be cancelled. Instead, my credit card was charged. I sent a second (certified this time) letter. Instead of crediting my account, another charge appeared. I called my credit card company and sent them copies of my previous letters. I then changed my account number to avoid further charges.

My credit card company disputed the charges for me and I recieved credit for the false charges. But two months later I recieved a notice from AOL asking for almost 100-dollars. The letter said they would contact a collection agency if I refused to pay. I don't know what to do. Should I pay the 100-dollars or risk having to write more letters to credit companies etc. One thing for sure, they won't get one cent of my money.

John
Wellington, Florida
U.S.A.