MTN Coverage complaint - No resolution or feedback for 5 months!

I am utterly disgusted with MTN's mobile services - I have a business contract with them paying +R1600 per month for voice and data. The reception in my area (Three Rivers, Vereeniging) has declined to the level that I have NO data coverage, and have to go into my garden to make calls. I work from home and cannot do my work anymore, clients cannot get hold of me. I have been asking for this to be fixed since November 2019, Ref ***, but have not received any feedback since that time. An MTN employee finally visited my home on 24 Feb and confirmed my issues, but nobody can tell me what is being done and in the meantime my business is suffering. I have now requested a cancellation qoute, and even that took several days to reach me by email. Then, to add insult to injury, my service gets suspended - the call centre says MTN's 'system sometimes does that' when a cancellation quote is requested! MTN claims they are known as a company who responds to complaints - that cannot be further from the truth! Meanwhile, MTN is happy to take my money whilst giving me NO service. Vodacom - here I come!