Breach on contract

I signed a 12 month contract with Telkom for 20mbps uncapped fibre line with Vumatel . The contract is R806 per month . I am currently on month 7 of 12 . So Telkom decided to bill be incorrect for FEB. I am suppose to get a discount every month on the deal i signed. I have logged the fault now 3 times and nothing gets done . My current ref is : ********** 5

I have a contract with Telkom for R806 per month . For the firts 6 months they billed me correctly now all of a sudden i get billed almost double . You are not honoring the contract i signed. I want this matter fixed now. I logged this fault on the 11th of Feb and nothing was done so far.