MBD Inc - will not listen

I have had an ongoing fight with MTN for over a year now in respect of data that they charged me for incorrectly. You keep claiming that you are handling the account, but I have repeatedly told you that MTN passed a R7000 credit on my account, and that Hammond Pole are in fact handling this. I have paid the final balance to them. I sent you an email - as requested - confirming that Hammond Pole are handling this. Esther is rude and belligerent and this matter has STILL not been removed from your books. She has the audacity to tell ME to sort it out. Firstly, I don't see why I should sort out your errors, and secondly, I have tried to call your company and it has cost me a fortune in airtime - and I have never even got through to anyone as I am kept on hold forever. STOP HARASSING ME WITH YOUR RUDE CALLS AND MESSAGES