Santam rip-off- Santam triples market values of cars to maximise premiums!!

My wife`s car was insured at Santam four years ago and they stated the market value was R44200.00. Asking for a new quote now, suddenly the market value is R103000.00. This is ludicrous as I don`t even know of a super car that increases by three times in value in four years time. Gonna take away my other car, building and short term insurance as this is daylight *******.