REFUSE TO REVISE PAYMENT

I LOOKED FOR RENTAL CARS WITHOUT CREDIT CARD THEN CAR TRAWLER WAS FIRST ON THE LIST OFFERING A CAR FROM BUDGET, I DID THE ONLINE BOOKING USING MY VISA DEBIT CARD, ALL WENT WELL THEY EVEN TOOK PAYMENT IMMEDIATELY NOW WHEN I GO TO COLLECT THE CAR, NOW AVIS SAYS THEY ONLY ACCEPT CREDIT CARD AND I MUST ASK CAR TRAWLER TO REVERSE PAYMENT, ALL THIS HAPPEND IN LESS THAN 24HRS AS IT WAS A SAME DAY BOOING NOW CAR TRAWLER IS REFUSING TO REVERSE THE PAYMENT. CANT THE BE CONSIDERATE AND CONSIDER THAT THE BOOKING HAPPEND WITHIN 24HRS AND WHY DOES THEIR SYSTEM ACCEPT DEBIT ORDERS DETAILS IF THEY CANNOT ACCEPT THEM. ALL I AM ASKING IS MY MONEY BACK.