terrible service

i have had a cell c contract for over 3 years and took out another one both with insurances ,my phone broke down and called the insurance to claim i was told i do not have insurance ,contacted my back and they told me the debit orders have been going to c insurance ,i called them again they still declined .now recently i cancelled my contracts telephonically and wa signed up to a deal of R29 per month starting end of jan ,however the amount debited was R183 ,i called the Customer care and none of them could help ,i went to the store and was told i was over charged i must call the call centre again ,which i have done with no help -