Continuous Bad Service

Vodacom continue to surprise me with their lack of service. The customer service agents only say sorry...they can't do anything else. For 4 months all I have wanted is to change my name on the invoice. They keep getting it wrong, everytime...and then I have to wait a whole month again...just to find out it's wrong again. And when you complain, all they say is sorry...no solution...or 7 to 14 days to get the matter looked at ***.