Once you calm down and get in touch with your attourney, he/she may explain to you how these things work. The store gave you a conditional coupon for a furure purchase (the condition being that you purchased the leather jacket). The act of accepting the coupon in itself shows you are aware of the condition (spend over 75 bucks at a later date and get 25 off THAT purchase. They are not in business nor legally liable to give you "unjust enrichement" because you only want to return part of the transaction, leaving them 25 dollars in the hole (whats to say you DON'T change your mind and use the coupon after this rage coursing through your veins subsides?) Or that you are a person of your word, will not buy from them again, but give the 25 buck coupon to a friend who has no qualms over saving 25 bucks after spending 75 (a VERY generous discount)

I hope your lawyer dosen't string you along while knowing the chances are nil that you have a leg to stand on.... some do just for the fees.

It's NOT unreasonable in ANY sense of the word and it's NOT urgent by any means. Do the right thing and you'll get your money back. Be bitter and hold on to the too small leather jacket AND coupon.