Full of mistakes and poor management

Series of poor service and handling. I have been a adsl customer for over a year but was paying for a landline add-on I wasn't using (we don't have a landline phone) so requested after a year of free money to Telkom to cancel that add-on. Telkom proceeded to take the required 2 months to cancel. However they cancelled everything. The land line, the add-on and the adsl. This goes against their policy of contacting the customer before canceling all lines to confirm that is what is requested. My wife had to deal with an exceptionally rude manager at their store in canal walk who didn't even understand the difference between a physical land line and an add-on land line service. We decided to write this off as Telkom could not resolve the issue. Now I have received a bill full of notification fees dating from AFTER they cancelled the lines (lines were disconnected before the end of the month leaving us high and dry over the weekend). A request was given 2 months before our lines were erroneously disconnected and now I am being billed for it? I want this bill cancelled immediately as I will not pay for a service we are not receiving which was the fault of Telkom in the first place. Will not deal with Telkom again at this rate.