MTN debiting my account without my permission

I migrated my lines to the new packages and consolidated my accounts onto one business account and have been over billed and MTN is debiting my bank account without my permission. I have reported this on several occasions through the assistance of Fred from Cosmonet who has logged two USD *** to make 100% sure that they have me on the network on the right packages and USD *** to check for credit once feedback from the first come through. What has happened is that my packages haven't been loaded correctly and I have been billed for airtime and data usage that is higher than the package stipulates.