Billing overcharge and refund problems

I had to log 3 calls only to be told that both my cases has not been attended to. The 1st case was for a rejection note added on my bill because of a early deduction and following a double payment on the 2nd case logged. The call centre agents has been trying their best to help me but the departments where the cases has been assigned to has not been actioned. Clearly the staff the that works in escalations has no urgency or customer service as still no feedback has been given to any of my cases. I have also logged an email dispute as per the agents Telkom has no complaints department. The query was emailed to him but still no response from that as well. Really no urgency in assistance.