Paid for car rental but received no car

Extremely poor! I booked my flight via travelstart and then also decided to do the car rental on travelstart. The rental was confirmed via travelstart at europcar all online and the money withdrawn from my account as the confirmation came through.when i arrived at the europcar reception desk after my flight to collect my car with my booking voucher etc they said they had no booking for me. They weren’t even aware despite me showing them the voucher and the confirmation email etc. They also had no automatic cars even available.I phoned travelstart who said they work via cartrawler. They phoned me back and said i must phone car trawler who would refund me. (Although i booked on travelstart website) By then i was late for my function and had to hitch a lift with someone else as they had no car for me. When i phoned cartrawler they would not refund me and said they first need to investigate what happened. Tomorrow it is a month-i still have not been refunded or had any feedback from eother travelstart or car trawler despite numerous phone calls and emails