Vodacom terrible customer service

I have several times contacted vodacom, to change my contract details to my new business details, and to have the direct debit taken out of a new account. I have emailed documents to them on 2 occasions and nothing is being done. They are also taking money out of the new account and claim they do not know what it is for and they have nothing on record. There service is terrible!!!!!!!!!!!!!! Will never recommend- I have been with them for 10 years and would change if I did not have a contract with them!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!