Mtn, payment misplacement!!!

I am a loyal mtn customer, I have always paid my account at the end of the month. Last year in November I was struggling to make my payment via the mtn app, like I always do. I decided to use my mobile banking app to make the payment. Shortly after I made the payment, I realized that I use the incorrect reverence number, In that week I phoned mtn, and explained what had happen. I sent them proof of payment and bank statements. I though everything was sorted, but *** I was wrong. I phoned them again the end of December explaining it says I am behind a month, and I explained the situation. I sent all the proof but still nothing happened. Finally after struggling for a few months with their call Centre, I finally went to the Brooklyn MTN store in Pretoria, The lady was every helpful, and assisted me with my issue. She took all the proof of payment and bank statements and submitted a claim and informing me that it should be resolved in 48 hours, but for just incase follow up in 7 days. I had not heard anything back from mtn, I emailed the lady several times, where she only rep**** after a few emails. I went back to the store 3 times, I phoned mtn last week asking about my case and that informed me everything is cleared up. Today they decided to shut my sim card down. I phoned mtn, to reactivate my sim card, explained the situation, they referred me to another part of mtn department, that department gave me an email to mail. after tipple checking that the email is correct. I email the email, and it tells my I can not send emails to that email. I am absolutely fed up. How many times after several months do I have to explain to mtn, give them proof and still nothing has been resolved. What do I do now. I feel like crying and crawling into a ball. I don't need this stress in my life. Why can't mtn understand that a payment has been made and they must fix the error on their side.