Bad service

I am experiencing bad service from MultiChoice, it is a month and one week now. Every week, sometimes twice a week they disconnect my account saying i haven't made payment. I have called their offices, communicated with them via live chat and have sent proof of payment more than once, but i still have to do that every week as they keep disconnecting my services. I do not know what to do anymore, it has costed me much on my pocket having to buy airtime and data trying to resolve the issue. I received an sms again this morning of service being disconnected yet i have made payment.