Refusing to close paid up account and charging me for it

I requested that my account be closed on 6 April and submitted the necessary forms. Its 30 April and my account is still open, I have followed up a number of times without a single person taking it on themselves to make sure the account is closed. This has been dragging for so long just so that they can siphon as much fees and interest as possible and keep the account open against my wishes. Just this morning I woke up to monthly fees going off my account, fees that I should not have been charged as I requested closure at the beginning of the month and ofcourse being told that I need to make payment to Discovery because they dont know how to do their jobs.