Booked online for a rental for 3 dayswith CarRentals for the first time at 55 pounds. Booking was confirmed online. I took a picture to prove this. Received an email subsequently to say that the QUOTE was confirmed. Rang company several times on their number mentioned in the QUOTE email and was unable to get through on 3 attempts. Replied to email with QUOTE and was informed that the email service is not monitored. Downloaded their app and finally found another number which I got through immediately. Was informed that my booking had not been confirmed although it was CONFIRMED BOOKING online as credit card transaction did not get through. Now the car booked was no longer available and had to pay over 400 pounds for a smaller car. Asked to speak to someone else to resolve but was informed that they were the customer service number as well. Had to make another online separate booking now costing 135 pounds for the same length. I am on holiday and have had to waste time making alternative booking. There needs to be a review of the practices within the industry!