Discovery Bank Incompetence

I requested a settlement letter in June for my Discovery Credit Card. It took Discovery 5 days and 2 phone calls to get an actual settlement amount via an emailed letter. The account was settled the same day and a mail send to Discovery with the instruction to close the account. A month later the account is still open and they harassing me for a new settlement amount. Even though its small its their incompetence that's the problem. The bank is even worse than their other products Worst bank ever stay away.