MTN the worst service provider

I couldn't make calls from my cell phones. I went to the Greenacres MTN branch where I was told that my lines were closed. When I asked why they said they don't know because I have no outstanding balance. After waiting for 1.5 hours for them to fix the issue I was told that their system is down but they have my numbers so they are going to fix the problem. Up to now they are still fixing it. 3 days later they are still fixing it. I am really frustrated.