Extremely disappointed.

Extremely disappointed. I have always been a fan of cell c always advised people to join the network due to their affordable rates. I have recently been having a problem with missed calls not displaying when I am on a call, the number is a business number hence it is crucial to my business to be able to see who called me to be able to call them back. I have phoned customer care no less than five times I have logged an escalated error with them for a technical specialist to phone me back I have also been to a cell c shop all to no avail. I will be porting my number to Vodacom if the error is not resolved within the week.