Bad Customer Service from FNB

This is month no.6 of being debited for a Credit Card that was settled and closed in January. Every banker has assured me they’ve closed the account (every month) but here I am inconvenienced once again. I’ve tried everything, I’ve been to the bank, I’ve used the Online Chat function, I’ve written reviews here (this is the 3rd time) on the same issue. I’ve spoken to multiple agents from FNB but clearly they ALL can’t seem to remove this debit order. I have given you guys 6 months & you have disappointed me once again!