Vodacom Refusing to Remove ITC

I cancelled all may Vodacom contracts over a year ago (after being with them for over 10 years, I discovered they had been subtracting a cool R150 per month for services they couldn't explain). I went onto prepaid before finally porting all my numbers. However I have now discovered that Vodacom has listed me on ITC for unpaid bills. I have been into multiple Vodacom shops and I have given up on arguing this amount and simply want to settle and never have anything to do with the brand again. However, it's impossible to get them to finalise this. They don't call back and nobody can help me got my name off this forsaken list. Please could somebody help! For ovee 10 years I paid everything. Then you became ***** and I left and now it's as if you are punishing me?! Come on! Be professional: take the money and take my name off!