Donut Bistro

My husband went into donut shop and had a coupon from the school book that is put out yearly to help our local schools. Even though the coupon is good until December 2014 they refused to honor it. I called the donut shop and the lady that answered said the same thing that they would not honor the coupon and even made a snide remark about me paying $20.00 for the coupon book from the school. She said that they do not like the company that does the coupons so too bad for me. Is that legal?Product_Or_Service: donutsDesired SettlementI just want the public to know they are not honoring these coupons and if that is legal.Business Response Coupon is not authorize by Donut Bistro.