Poor service

I have joined a Telkom sim contract for data, and I have notified the customer care to change my banking details and they refused telling me I have to be using a banking account for three months inorder for them to change it, the worse part they are charging me R200 saying is for penalties for debit that have failed while I have notified them am changing banking details, the worse part they require me to make payment 10 days before debit order manually. Your system is failing us as telkom.