No feedback on query

I spoke to consultant who gave me misinformation when I upgraded. I've since been over charged. When I phone to ask them to listen to the call with the upgrade consultant a call is logged. When I phone a week later, I'm told I'll be contacted, I've received no such contact. I phone today and I'm told the query is with the upgrade department, so I'm put through to them, only for them to tell me they have no information as it wasn't their department. Seems like the customer care was Vodacom was once known for, is no longer.