Poor service to close Credit Card

I called Discovery Bank a week ago to settle my credit card and get a paid up letter, i was told an agent will call me in FIVE DAYS just to give me the amount, i then waited, nobody called me, instead i got an email 4 days later. Fine, i paid the amount the same day. I then had to call again to ask if it can be closed, i was told no, i must send an email and wait again for someone to call me, still, no call, just a automated reply two days later that my email will be referred to someone. It feels impossible to get this card closed and a paid up letter received. I will not recommend anyone to this bank as their after service is pathetic.