Discovery Bank Card - Difficulties in account closure

On 18th November 2024 I contacted Discovery to close my credit card. I was given an amount to pay to settle the amount owing on the card & this was settled immediately. On 16th February 2015 I received an sms stating that I needed to make a minimum payment of R56.65 on the card. I once again contacted them & told the consultant that I had requested the account to be closed on 18th Nov 2024. She said she would speak to a manager about this matter & get back to me, which did not happen. Yesterday I received a call from Discovery to confirm my e-mail address and received a mail regarding account closure stating I need to pay R349.19 to close the account. This account was paid in full on 18th November & should have been closed by them. I will not pay the additional amount requested as it is not due & it is impossible to get someone on the phone to understand this concept. Please advise.