Booking.com – Car hire

While I was on holiday in Cornwall staying at cottage I had through Booking.com in the last week in May, half way through the holiday I was involved in a car accident that left my car undrivable which meant I had hire a car to get me and my luggage back to the midlands, I was originally booked a car from Europcar. but after a phone call to my nephew, he arranged a car hire from Enterprise car rentals in Newquay which I thought would be cheaper and I could leave the car another Enterprise car rentals in the midlands, but on checking my bank account statement I found on the 31st of May, Cars on Booking took out £188.12 and also on the same day Enterprise car Rental took out another £215.00 which made it nearly twice as expensive as Europcar, I have contacted customer service sometime ago and I was sent a message someone would get back to me, but no one did