Just been billed £400 for tiny bump on van I hired from Avis at ncl airport. Nobody available to inspect before I left, so I checked alone & was OK. Left it at 1600 yesterday & fine but again nobody there. Just a key drop. Van was left in drop off area open 24/7 with other cars in & out. Email this morning saying inspection at 0915 today & there's a bump as if it's been hit overnight. I've complained but anyone got any advice? Seems well dodgy.