MTN cancellation

I canceled my contract on 12 September 2022. I paid a cancellation penalty fee of R708.00 at MTN Store La Piazza Square. I've sent several emails to retentions, customer care and complaints but they don't respond. Everytime I send an email I just get a reference number and in the end of the month I still get the bill, what was the use of paying a cancelation fee. They don't help you instore, don't answer when you call and don't reply on emails.