Worst Service Provider

I have a huge problem with MTN. I have a top up contract and end of November 2018 I went to MTN Brits mall and asked if it would be in order if I pay my December payment through my Capitec bank app. The person assured me it would be fine. On the 18th of December they suspended my service. Ons which I contacted client services and went to the bank and got a bank statement and emailed it through. My services was connected again. Not long after they suspended my services again on which I went into Mtn Brits mall branch where I explained to them the problem. I got little help and was told that this was not their problem and they can't help me except email my proof of payment through to client services. I went to my bank and the consultant there helped me and phoned mtn and explained that the payment did go through. Mtn connected my service again. On Monday my service was disconnected again. I phoned mtn client services again and was told that they never received my bank statement /proof of payment. There were no notes on the system of my previous calls or,correspondence through email. I used the email addresses that was given to me by mtn and I send it through numerous times. I am so frustrated that I have to struggle with this nonsense because of lazy and *********** people that has no pride on their jobs and mtn has the worst service I have ever experienced in my life. My fiance has been with them for almost 20 years and we are looking to take out contracts else where.