Booked a car online (from Australia) via their website. Booked it for 16:30 on 21 April 2019. Was out through usual immigration procedures with an hour to spare. Logged into my account to review my booked car. Result came back as no bookings available for the given reference number. Repeated calls and enquiries from Heathrow information produced zero results. My account's Booking information continued to show, "You have made no bookings to date" even at 16:38 on 21 Apr 2019. Forced to make plans to continue my journey at the last minute. Received an email confirming my booked car around 18:00, one and a half hours after it was supposed to have been ready. Despite the above, they proceeded to charge me for the car reservation