I' a bad payer because Vodacoms Finance dep is !!!

Hi. I recently had a issue with Vodacom where they overcharged me for a few months for no reason (Spoke to Nathan Elroy). Now i have a bad payer or low credit rating because they debited an extra amount that should not have been debited and it returned unpaid. I have tried to upgrade a data contract twice now and both times i sat in the vodacom store for +- 2 hours with the sales person trying to speak to the accounts guys and get my rating fixed...Today i sat another 2 hours as i need to get this sorted. as requested previously if vodacom cannot sort out this issues then they should cancel my 3 contracts and let me use another service provider, after 18 years of using Vodacom this service is getting worse. Can my rating etc be sorted so i can get my device tomorrow??