Cell Phone Contract Issues

I have had my contract suspended due to none-payment. This started when my top up contract went from R349 the one month to R927 the other even though I was only meant to be paying R499 per month. Now that I have paid the money expected I phoned in and also sent through proof of payment and my phone was re-activated only to be deactivated again two days later and my payment was not captured on system. I phoned 808 as requested but had three of the most horrible call centre agents on the planet with one of them plainly refusing to let me speak to his supervisor. I am still worried that my top up account will still cost me an arm and a leg and don't even know why. I refuse to be caught up in all this with MTN and will confirm to anyone who reads this to get out of this nasty service provider. Please also do help me sort out this issue with MTN if anyone can. Also do try and avoid the call centre in 14th avenue as it is filled with the worst agents in SA and they do not care what you say or do. there is no recourse for such bad service and such horrible employees anyway.