Issues not resolved and billed ahead of time

Telkom has become a thorn on my side. Took out a new contract two weeks ago, already charged me pro rata on the device and billed me for the end of the month. If that wasn't enough, they changed the amount I pay for my data subscription of R199 to R352.83 without communicating with me. With every call made to their consultants nobody can give me answers. Until these billings are resolved ill keep reversing my money. Im fed up with their service.