Pathetic service received

Logged a query with vodacom in February regarding service nr ***, they credited my vodacom account on 15 April after I told them to credit my bank account. Today I phoned them and they said it will take 7 -14 days to resolve. I am fed up with vodacom not returning phone calls and passing the buck. No supervisors or managers are available if you want to refer . If you dare to pay one day late they cut your service, but if they own you money it can take 3 months to resolve.