Telkom - Overcharging Penalties

I have an account with Telkom. My monthly subscription is R150.00 per month. Due to circumstances that prevail in an economy such as is in South Africa my debit orders payment to Telkom has bounced. Telkom have charged a R200.00 penalty for this. This is more the bank charges me for a bounced debit order, this is more than my monthly subscription. I have tried phoning Telkom and get left listening to "all our operators are currently busy" which has cost me further expenses in airtime, 3 days in a row for over 10 minutes, I am quite convinced that the calls will not be answered as I selected the option to log a dispute with billing (option 8) and the call is just sent to the recording and nothing is answered, its a ****. I spoke to someone to get advice, the recommended that I start with Hello Peter and follow up with the Ombudsman. Something about the Consumer Protection Act and being Unfairly Overcharged. I tried sorting this out at a Branch of Telkom, stood in the que for 45minutes only to be brushed off in less than a minute and told to call the call center. PENALTIES HIGHER THAN MONTHLY SUBSCRIPTION - is this legal ??