MTN contact cancelation

I got an LTE contract from MTN in September 2021 for the amount of R995 per month whereby the tge first of August it went up to R1450. I tried to cancel my contract before it went off as a debit order but according to the mtn shop they couldn't cancel it as I was still in contact and advised me to cancel before the 16 of August. I canceled my contract with MTN on the 15th of August with a reference number and was said that it takes 30days to approve which means another month of R1450, keep in mind that the contract expired already. I thought that on the 1st of September 2023 will be my last debit order as I canceled my contract, by MTN charged me again and I DISPUTED tge debit order and canceled it. I Called MTN to find out what is happening gave them my ref number and was told the contract was not canceled for some reason. MTN said they will investigate tge matter. On the 1st of Nov on a way they loaded a debit order without my approval on my account for R2945 which I agian DISPUTED. Got no feedback from the investigation thay did on their side but they still charge me and keep in mind that MTN card doesn't even work anymore it is disconnected from the system