NO! Telkom I do what your service at addtional cost

Telkom charges me every month a debit order cancellation fee of R200 because I do not have a bank account for the debit order to be processed again. I do not work anymore and can not afford the additional fees. My contractual fee is R121 a month. Now I need to pay over R300. I pay my account every month cash before the due date, but because of the Telkom system do not have a cash option, I am penalised. Please can I cut my tied with Telkom.