HORRIBLE MTN SERVICE

I have had contracts with MTN for 6 years now. I spend R1460 per month with Mtn! But their service is horrid ! This is my story: One of my contracts ended on 17 May 2020, I called before then to confirm when I must cancel the contract. They said i should call from the 18th. I called the retentions department many times. No one ever answered, even after holding on the line an average of 20 minutes per call. I then emailed them on the 22 May 2020, i receive a response a few days later asking for some personal information in order to proceed with the cancellation. I sent the information that was requested. I was still billed on the 25th of June for a contract that i cancelled !!!!! i then called again. and explained to a gentleman the situation. he then asked me to forward him the emails that i have been sending. and assured me that they will sort it out. To date, i have had no feedback and am unsure if the contract is cancelled. MTN NEEDS TO REFUND ME.....URGENTLY !