incorrect recording of the millage

I am writing on behalf of my mother Mrs magdeline moloto. She bought a Toyota corolla in 2011 for cash. She sent her car for 15000 km in 2012 however in the service book it was recorded as 30000, she reported the matter to annalize and nothing was done to correct this. Instead we she came for 30000 service 45000 km was recorded in her service book. She booked her car for 60000 km and she could not be helped because there was power outage. This is a misrepresentation of facts and believe that they are taking her for granted because she is 63 years old? It shows that next time they will record that her car has 75000 km and expect her to pay for this service. I will report the matter to the consumer commission if not dealt with appropriately.