Paying account, but still threatened!

I believe that if you pay your account as per agreed arrangement, you need to adhere to the protocol. On Friday (16 October) my wife collected a registered letter dated the 22nd of September, from Stanley Bodkin Maditsi regarding my Credit Card account. Why do I receive a letter without notifying me of any outstanding money as set out in your communication agreement. After all, the telephone number appears on all deposit slips. After sending emails to the applicable people involved, I did not receive any feedback as such. Please get all facts together before I take the necessary steps to fight this cause.