MTN giving contracts to third party companies to ***** your money.

I have been struggling since October to get back money that was deducted from my account by MTN. They allowed a third party company to make changes to my contract WITHOUT MY PERMISSION, deduct money from my account, and now claim they cannot assist. The third party company shows no interest in rectifying this matter either. My account and agreement is with MTN, it is therefore their duty to rectify this matter. All that has happened since October is that MTN blames the third party and the third party say MTN must rectify. As usual, the customer suffers and nobody does a damn thing to help. I've been a loyal customer for 20 years and this is all I get..... very disappointing.