Allegiant Airlines Sanford, Florida I was Refused car rental , allegiante set up the car rental, I prepaid, did not have a credit card on my arrival, had to go elsewhere to rent a car. now Allegiant refuses to refund my money Sanford Florida

I arranged for a one way travel ticket for my disabled daughter and I on Allegiant Airlines for Feb 27, 2015, I also arranged for a car rental .  The Itinary was made and I prepaid 6 weeks in advance.  I called early the morning of the flight to check weather conditions, as there was a storm in the Texas area where we were flying.  They told me all was in order, I double checked my car info, they said everything all set, so we flew.  When we arrived to pick up the car at the airport terminal in Austin, TX, Alamo would not release the car unless I gave a credit card.  I did not have one to present, and no one told me at Allegiant that I would have to have one.  They KNEW I did not have a credit card, yet booked my car and took my money anyway.  Now they refuse to refund my money.  They honestly should have to pay for my room as I had to shuttle us and stay close to the airport until the next day to get another car elsewhere.  I was driving to Ft. Worth, and it caused us extreme stress and delay. Now they take my money too ?  Beware of their travel packages,  or you will be sorry. They were rude to us from the start,  bumped our seats after making us pay, and threatened me that morning I called to ck. on everything, that my bags will cost more if I didn't pay the extra fee, if they were even an inch too large, I would have to pay.   It was a nightmare and a flight from hell.  Frontier is a much better airline, and I called them to get our flights home, now my bank is going to have to intervene and charge back my car fees.  They really should be ashamed...how unethical !