Missing airtime and data

I complain because my wife does not want to(because Vodacom dont help and dont get back to you).my wife had Data and Airtime on her phone today and suddenly it was gone.she cant remember how much it was.this is not the first time it happened to her.The last time they said they will look into it and come back to her but she is still waiting.she left MTN for their incompetence and carried her number over to Vodacom but its just a new provider with new problems,but sure as hell the same happened to me also.this really sucks.