Incorrect Billing and Invoicing

<p> I have a Mobile Contract with Telkom and I have never experinced any problems up until recently. I have been over Billed (my account being debited twice for the same amount) and incorrect Invoices (reflecting amounts that have been already paid as overdue. What frustrates me more as client , I have called the Telkom call centre, agents do not understand simple accounting & maths (unable to help). Went to a Telkom branch Westgate i was advised payment has not reflected and I should come back once it reflects. Irregardless of me providing all neccerary documentation to prove payment. Too top it all "Telkom will not refund a client the amount taken , they will rather credit you the following month. POOR SERVICE !!</p>