disgusted with service and being billed incorrect

For more than 2 months im trying to proof to mtn that when i buy data through self service i need to load airtime for this to be done. I now get billed on my account for that data through self service and need to load airtime before i can purchase the data. Photos was send as proof of this... spoke to consultant shanice who said shes sorting it out and wil get back to me on the same day.. week later no feedback just getting smses of my data being cancelled. For the second month i will mow be paying more than R100 more than what i signed up for and no one has answers to this but i need to pay or else will be cut off.<br> <br> Uterly disgusted with this service since i upgraded middle last year