Vodacom useless lipservice once again.......

Dont even deserve 1 star.... Have a problem with accounts. We have been billed in error. We have all the paperwork to show its an error. I get lip service from Vodacom that it will be fixed but ABSOLUTLY NOTHING is done. We are now receiving threatening calls from MBD because we will not pay the error. If I pay that error we will never ever see that money again because Vodacom accounts department is absolutly useless and won't get off their butts to check the account - even though I have done all the work and sent them all the paperwork. Deon - who apparently handles all the Hello Peter complaints, even called me and also offered lip service and has also done a BIG FAT nothing!!!! Thanks Deon, really appreciated - NOT...... So..... Vodacom please tell me what i have to do to get YOUR error corrected?????