Unsatisfactory Service from MTN

I was called for an upgrade on the 9th January from MTN retentions department. I was offered an upgrade, which seemed good at the time. The offer was for R499, which gave me more airtime and data. After looking at the contract I saw it wasn’t what I needed. I called and cancelled on the 12th of January 2023, which was within the cooling of period In February I get a bill of approximately R3700 I have made several call almost on a daily basis to try and have the problem resolved, I also went into their store. They acknowledged that I did indeed cancel the upgrade, but for some unknown reason put onto a higher package, this I didn’t sign or agreed for. My line has been suspended for something I’m not responsible for. They tried to get me to make an arrangement on a incorrect billing, I refused because it would have meant I’m taking responsibility for the charges. My credit rating is now been threatened as a result of the incompetence of the staff at MTN. Some don’t even listen, they in a hurry to transfer or get rid of you, They would tell you that the matter has been escalated, I don’t think they know the meaning of escalation. I also communicated with their customer care department, no response except an acknowledgment The must change it customer don’t care department They have been having technical problems, for the past few weeks, your calls get cut or in audible They don’t call back, you have to call back and repeat yourself all over again Maybe it’s time I move to a new service provider