Double debited yet no refund

I was debited an amount R650.00 even though my bill of the same amount was paid. I contacted Telkom Mobile on 081 180 and queried this. I was advised that it was an error on their side and they will assign a case manager. What scared me was I was also told that a refund could take up to 1.5 months. WHY must MY money be refunded after such a long time? If I do not pay my bill I am certain my line will be cut in no time. Will Telkom give me 1.5 months to pay my bill? I highly doubt it. I called Telkom back after a few days and was told nothing was done and it will now be escalated to a manager. Once again, a week later, I am yet to hear from anyone at Telkom. This is pathetic service. Why offer such good deals and then compensate it with terrible service and over billing? If my money is not refunded by this Friday, I shall have to escalate this to the Ombudsman. I am quiet sure nobody will respond to me or the response I will get (which will not suffice) is we have escalated this matter to a case manager etc etc. The point is I want my refund ASAP!!!!!