horrible experience with thrifty

My husband and I booked a class C separately and our bookings were confirmed. On day of collection we met I believe Mr Nolan who was assisting on the desk. To our horror we were told the car was unavailable and only class B available on a higher price than what we initially budgeted for. We asked how can this be and were told it was probably an overbooking. At that time Mr Nolan had already taken a deposit and he told us he can refund us coz there is no Class C. We needed the car to travel with 5 people and luggage and we had to scramble for another option of car rental which was no success and eventually coming to terms with being cramped in a class B car. The assistant was very rude even to his colleague (car inspector). Coz we were out of options and put of time we took the car but we wont be using thrifty again.