Incorrect Billing and unable to resolve query

I had the LTE 50 GB line installed and was on a 24 month contract which came to an end in July. Thereafter I was on a month to month contract. I then took out the fibre line which was installed in October and requested cancellation on the 5th October. I then went into the telkom store at Northgate as there was no response to my emails. Todate my LTE has not been cancelled and I am being billed for fibre and LTE. i have been paying for what I was quoted on which was R599 and being aying more in fact.I need this resolved ASAP as this is unacceptable client service. I am now being told that I owe R4000 which is in arrears.