After an awful service, they send me an invoice of £1,400 for some hypothetical scratches I never did. They don't even show you the car, nor the contract, but once you have signed you are fully responsible and the company is shielded.
Totally useless to present a complain to their customer service, as they are the ones who make you pay the unfair invoices.
Unfortunately, I've seen loads of people in my same situation.