MTN IS THE WORST NETWORK

I took out a new contract with MTN Direct, i requested ontop of my 300mb data a extra 1gig of data to be added, none of this was done. Now due to their incompitence in doing a simple request i was left with 2 crazy phone bills due to internet usage! I have called them consantly and im no closer to having the issue resolved. I am demanding a refund and to cancel the contract but they refuse to help or even call me back.<br> And ontop of it all, on my phone bill it says credit limit of R717, a limit is something you can exceed, so how can my phone bill be R2200 AND R1800. I hve waited a month for a call and no one responds, even the managers dont bother to call and fix the issue!! <br> SHOCKING SERVICE AND I WANT THIS RESOLVED ASAP