Kept in ransom and unprofessional behaviour

I have four or five contracts with MTN. One of them expired on the 26 July 2023. I called two weeks ago to cancel and I was told that I had to pay about R5K because i need to cancel on the day the contract expires. I called today and spoke to 3 f=different people at the cancellation and they kept me on hold until my call got discontinued. I call customer service and they put me through to cancellation and I spoke to Lindi who was so rude she told me in a very arrogant tone that what must she do if the system is not working, I asked to speak to the team leader and I was not transferred until my call got cut again. MTN cannot keep us at ransom , when they do not want us to cancel the contracts.

Daphne Tlhabela ***