MTN Not Treating Customers Fairly

So MTN is running this new thing where as they just decide to increase customers bills if they do not respond back to an sms. They sent me this SMS in November Stating "we got you". I complained about it to them then it was resolved. Then in the same month November 2019, They send me the exact same sms. I then complained again, every is was fine. They sent me ANOTHER SMS in December where as I complained again and they told me my bill was not increased, the reason for that was that I sent a sms back saying No. So the lady working with my complaint said that she stopped it which is not true, I told her that I am not happy with that and I want my complaint resolved, she never called me back my complaint was never resolved. So today I receive the same sms ONCE AGAIN. I then called in and spoke to Lungile the agent and to her manager Nhonipho only to find out that my previous complain was closed, but it was not resolved. Is this how MTN treats there customers? Closing complaints before its resolved? I have been having problems with MTN for years now and I'm literally at the point where I had enough. I speak under correction but I think I paid my account in advance in September or October 2019, I paid it up until September 2020 because I am sick of MTN and the bad customer service. So once my contract is due to come to an end I will definitely close this account because MTN does not know how to treat customers fairly. One would think by paying you bill in advance they would leave you alone but yet they still causing problems. TCF (treating customers fairly) Read up on that!!!!!!!!