Debit order for a paid up Cr Card

Good day

I've been a loyal customer for FNB since i was as a student. I have a check account with them which comes with a credit card. A month ago i phoned them about closing the Cr card and they said i just need to pay the balance than they will close it. I did just that and now I have received an SMS stating that a debit order for the cr card will be deducted for April of which I didn't use it because i want to close the account. This is ridiculous and i find it unprofessional because when you phone their line they take nothing less than 25 min before they can attend to your call. No so happy with this.