Incorrect billing

I am not happy at all with the service received from Telkom. I paid my monthly instalment last year December and they have now disconnected my line stating that I have not paid, however when i call their call centre, they can see the payment on their side however they say they do not have the powers to connect my line back? Im furious that it has got this far that they have disconnected me! If this issue is not resolved in the next 24 hours i will escalate it and it will not be good for whoever is responsible!