MTN needs customer service lessons!

I really am disappointed in the horrible customer service (or lack thereof) from MTN. I previously had a contract with them and they would just suspend my account because the pay date fell on a Friday and did not reflect in their account before the first. I decided to give them a second chance and now have a month to month fibre line set up. The speed and signal are wonderful. However, I have an invoice for R200 more than I'm meant to pay???? This whole thing was done over the phone and it was said that I would pay A and then after a time I would be charged B. But from day one I was being charged the higher amount which is total BS. At this point I am seeing if it is even worth the higher price. Right off the bat I am so unhappy due to this and to make it worse, nobody is helping me rectify this issue. Nobody is getting back to me and when I email them or log a ticket, I get nothing from them. I've been trying since Monday and am getting nowhere. It's not worth it.