Paying for service that was not rendered

My mother took our car to this company for a diagnostic test on the 5th march in order to get feedback as to what exactly was wrong with the engine temp cooling system and radiator as the car kept over heating. she was quoted R450 for a diagnostic test to be done and was guaranteed that she would receive an email on monday 7th march with the results of the test as their . monday came and no results were sent to her so she went back to the company to request feedback, however the guy she spoke to on monday told her that they dont do reports on the results they only do it manually. The only feedback they could provide her with was that there is a problem with the radiator but could not explain exactly what was wrong with it. my mother spent R450 on a diagnostic test that couldnt provide her with any information about the issues she was experiencing with the car other than what she originally told them what was wrong with the car. I highly doubt that any test was compiled on the car and we have spent R450 on a company that cant provide a service.