I WANT TO CANCEL MY CONTRACT!!!

I've been a loyal customer for over 10 years. I am now cancelling my contract due to poor service and MTN *****ing my money. They have been over debiting my account due to their system migration. Now I'm battling to get my money back and they keep closing my logged calls. My contract is due for an upgrade and I want to cancel. I was told over the phone that I'm only able to cancel in 2022. This is outright wrong and you are *****ing money from your loyal custmers. My 24 month contract will now elapse in February. Please be cautious if you wish to take out a contract with MTN! I will continue to write the truth until it is resolved.