Michaels stores Michaels arts and craft stores Vague return policy, impossible to return at Michaels arts and craft supplies store Tukwila, Washington

I purchased a large board about 60 inch long from Michaels.  I noticed the corner was damaged but I really had to cut the board and ignored it.  But soo after I purchased it they refused to take it back when I tried to return it.  'not in original condition' they told me.  and it also has a scuff mark.  Wow I was blown away, did not realize they would have such rude response.  Also at the time of purchase they would not let me use the discount coupon which clearly says any regular price item.  So here I am out over $15.  And it is not the money part alone because I make lot of purchases there.  But there bad customer service and very unreasonable return policy has really turned me off.  I hope this complaint leads some where to improve there attitude and may be change their return policy.  Lots of items have to be transported and often package must be open before making a decision that item is unusable and must be returned and by that time it is too late because it is not in original condition.  Very deceptive return policy.  They might as well say not returns.