Bad service

I'm struggling to get Multichoice to fix the billing mix up they made on my account, even though I'm an annual subscriber, of which the subs will expire in December 2019. Since June 2019, I've had my service being cut off because they say I'm owing (not true) When I call them, they do confirm that I don't owe and I get promised that the issue will be escalated and the matter will be sorted. Unfortunately they cut off my services every week, and have to call in all the time. and get to hear the same story all the time. The supervisor, Mustafa, promised me on the 8th July that he will sort it out and I won't have to call Multichoice ever again with complains. Since then I've had my DSTV switched off on the 13th & 18th July. Who do they think pays for all the calls that I make? Their service sucks. The thing is they don't have competition I think that is why they are taking people for a ride.