Horrific service from Telkom

Requested a line transfer for a ADSL line beginning of February, after countless calls and visits to a branch the transfer was done around 7 months later, only for the line to be cut a few weeks later. Again many calls later the issue was fixed after a month or so. During all of this I was still billed by Telkom every month, I submitted a dispute a while back which has come to nothing. I paid the monthly fee for February and March thinking the transfer will happen quickly. I now have a bill of almost R6000, when technically Telkom owe me money (one month of service in the last nine which I paid for 2).