MTN bad service

I had a cellphone contract with Mtn from August 2020 and ended August 2022.I was not advised that I’m supposed to cancel the contract prior it ending.I was surprised to get the sms on the 9/9/2022 stating that the amount which was even more than what I used to pay,was going to be debited from my account.On the 10/9/2022 I went to Wonderboom junction Mtn to enquire,I was told that I was on my month to month contract,and I was also on arrears which I wasn’t aware of.I was advised to contact retention department using my own airtime as their phone is not working.I was told the month to month contract was for data,and the data is sent to my Telkom number,which i never received.I then contacted the retention the following day,at some point I spent the whole 20 minutes on the call which did not go through,tried the whole day without going though.I then sent an email on the 13/9/2022,desperate to cancel this contract.I did not get any reply till this day,MTN debited the money today,for what?i dont know.MTN is making it difficult to cancel the contract,yet they busy taking the money.They never even tried to call me prior the end of my contract.I’m so angry and desperate,I don’t know what to do.