TELKOM CONTRACT NIGHTMARE

i am having an issue with telkom mobile,i had contract account which i cancelled last year july 2023 and in september i received a final invoice with zero balance and got a confirmation for closure,i opted to not keep the number active on prepaid,the 1st of june 2024 i received a statement with a balance due of R77.07,my frustration started when i contacted they service desk and i was informed the R77.07 is for phone calls made in may this year,i asked how is that possible after i closed my account for so many months to be suddenly being charged for a sim card that i dont even have(case ***9) was closed and resloved without even the feedback being provided.on the 25th of june 2024 an attempt was made to be debit my bank account and the was no funds which means i got charged unpaid fees and started receiving sms communication threatening legal action and that my name will be negatively listed with the bureau,yersterday i made another attempt to call where another case was logged with incident ***7,please resolve this as am not going to pay the money i dont know and having my name listed for the contract i cancelled long time ago.