Consumer Protection Act Violation

My contract expired in September 2022 and I was not informed days in advance as stipulated in the Consumer Protection Act. I only receive an SMS on the 12 October 2022 after initiating upgrade request. The monthly debit order was R 300 as per contract, however for the month of October I received a bill of R 2300. The number in question is ‪***‬

Please assist the Sim card was blocked but the money is still accumulating and this has affected my credit record

After engaging with one of the MTN agent she told me nothing will change I must pay their money while I was trying to escalate the issue