Charged for fixing Telkoms exchange

Please assist Urgently. I reactivated my ADSL line last month. Issue after issue and complaints the line was fixed by a technician. He came out and resolved a issue at the exchange. There was nothing wrong with anything at my house. He told me the exchange was a issue and it was resolved. I now get a bill of R1280.80 which is supposed to be R579.65. I will not stand by while Telkom rips me off. I suggest accounts resolve this before I approach the consumer board. I will not pay for a failing Telkom infrastructure. I have paid R600 for the service Telkom has provided a month early. If u guys want to keep me as a paying customer I suggest u resolve this because I feel **********...... Ref number for Technical ***A