Vehicle went for minor repairs and now Discovery Insure wants to almost respray the entire vehicle because of sub standard workmanship

My vehicle had to go in for minor repairs and some spar work to my front bumper and small piece on the right rear fender. Because the Panel Beater did sub standard work and failed to match the colour, the vehicle went back numerous times to rectify the mess, however, they now managed to respray almost 90% of the left side of the vehicle. Discovery now wants rectification work done to now also spray some panels on the right hand side to try and match the colour. This means that +/- 75% of the vehicle will now be resprayed which will significantly impact financially on the vehicle because of all the spray work as any person with some common sense will assume the vehicle has been in a major accident. Why should I lose out financially because of a Discovery appointed Panel Beater who did sub standard work failing to match the colour of minor spray work initially? I will NOT accept this vehicle.