I’ve never got it in over 10 years and each time Ive returned the cars they only have minor scuffs/trolley dents.
make sure your address is correct as they send you a check, seriously miner dings and dents are allowed, you may not of got 600 as it’s only recently gone up, for a long while it was 250 then it went up to 500 then they introduced the 600-700-900, i’d be very surprised if retuning 3 cars you’ve not had good condition bonus as Motability has the right to strike you off,