MTN debits R3000 from account incorrectly

I have been fighting this battle over a month now, MTN has debited R3500 from my account when i had a limit of R500 Setup, i had requested it be increased by R100 so i could use my phone for the remaining few days of the month, however the R3500 was debited, i queried it and They said they would get back to me in 3 days its been almost 2 months now, i am not the only person this has happend to at my work place , Till mTn sorts this out i will post this feed everywhere, i have already moved to vodacom and will be ensuring all 2000 of my ***orkers move and all friends and family move if this is not sorted out . their customer service is terrible you stay on hold for atleast 3 hours and when you get through no one can help cause no one is there or they are not senior enough, Really MTN needs to go back to the drawing board if not it wont have any business left as they are proving they know nothing and are completely useless