Mtn horrible service provider/non provider

It has been more than a year that I’ve been paying for a business account with mtn. And it’s been the same amount of time where there is basically NO customer services. I have made multiple queries about the service I pay for but don’t receive. I have been to branches, I have called multiple times and still NOTHING. As I am typing this message i was put on hold for 9min by the head office. Once I actually got through to someone the call was dropped. The 135 service is useless, it tells you to select 0 to speak to an agent but once you select 0 you are told it’s an invalid option.