Vehicle booked on line was not available

Th vehicle was booked on line and when I arrived at the Hire Desk,I was told that my vehicle had been upgraded.This was very nice but then I was told that me excess payment had increased and my Insurance premium had also increased. I told them that i didn't want the upgrade and then they said there was no other vehicle as per their quotation. I was then told that if I didn't' sign for the Increased excess or take the additional insurance at my cost then I could not take the car. So under duress I signed and paid the additional amount. The vehicle was a beautiful new VW Polo and was superb. however, I would not normally hire such an expensive vehicle and although it was very nice, it was far more than I needed. <br> The return procedure was good but was complicated by the refueling process and the reconciliation of the account and refund of my deposit. I sent off a query about the final account which was emailed to me after I had left the return carpark.and I have not yet had reply. I am not sure if my deposit funds have been released yet.