Franchise lying about tests run on my car

Very disappointed with attitude of the Customer Care department of Ford SA. I have had issues with a franchise of theirs in Cresta and simply asked for proof of the tests run on my car, only to find out that it would seem they DID NOT run tests on my car as indicated on my invoice. Customer Care advised I should be "happy" that I received an invoice and didnt have to pay for it. They closed my case as a dashboard light was switched off but are not bothered that their Cresta branch have **** to me and now the supervisor at Ford SA will not call me back to investigate why Im an unhappy client.