Scary horrendous experience. Hard to know who is who but I booked Flexi aka Vip Heathrow parking aka Ezybook. The guy who picked the car up was friendly. I misunderstood about the carpark charge (£5.30). I offered to come back but they said I had to transfer them £25. It seemed like a made up fee but I paid that same night anyway and they confirmed they had received it by text. But when I went to pick my car up the guy said I hadn't paid and he wouldn't release my car. Both numbers I had for the company went to the same guy who was accusing me of not paying - even though a text from the same number confirmed I had paid. He kept telling me to pay and to stop wasting his time. It was awful and scary. I was with my baby waiting in the cold,I couldn't get through to anyone else except the guy who was accusing me and I really thought my car had been stolen. Eventually he realised I had paid after all and said he'd release my car. The other car company guys were trying to help me and said this kind of thing happens all the time with the unofficial companies. It might seem like you're saving ££ but it's really not worth it.