Billing and account problems

At the end of Jan15 I was contacted by Telkom to upgrade my Wifi contract.The deal I agreed to was a LTE Wifi for R459 per month including 10G day and 10G night data.The first account I received I was charged a huge amount and I phoned Notando on the 20Feb2015.According to her it was for the few days of Jan15 I had to pay on the old device and then for the new contract.I received my statement end of March15 and called Chante Smith who promised that the billing will be rectified as I was charged and additional R100 for the 10G at knight.I explained that was not the deal I signed up for.I received my statement in April and yet again I phoned on the 7April2015 and spoke to Lunga and Claudia to give the same explanation.Now all of a sudden my knight 10G is gone when I look up my balances on the internet.I received a message on my device to say that the overpayment of R200 will be paid back to me and my 10G knight data will be restored.Seven days later I received another sms on my device telling me my payments are in arrears and my service will be affected.I have had enough of this up to **** service.You have not held up your end of the deal so according to me this deal is invalid.