Tired of complaining every month !

I have been having the same problem with Telkom for over 6 months now and this is starting to get very frustrating. Every month I am incorrectly billed on my statement for R 299 when my contract is for R 199.Every month I phone the call center and ask them to do the necessary refunds and they do with out fuss.However it is ridiculous that by now they have not made the necessary adjustments on their data base , to have this issue sorted out for once and for all.<br> Please attend to this matter so that I am not burdened with this same issue every month , I need this sorted out for once and for all and do not believe it is that difficult to permanently have rectified .