Atrocious Cell C customer care

Sent emails and various calls to customer care about my airtime query. It has been more than 72 hours and I have not heard back from Cell C after various attempts to contact them. They do not even send an SMS to say they will call at a particular time. Instead you have to wait all day every day for so many days to resolve the issue. Emails were sent with screenshots to verify my case and still they have a dilemma resolving the issue.