Dunkin' Donuts review: refusal of refund on mistaken swipe of credit card

I have been going to this Dunkin Donuts every single day for 13 years, me & the manger are on a first name basis, I do not even place my order anymore she automatically knows what I order. I went in this morning and my order total came to $6.34, I gave the woman working there my debit card which she swiped and told me it declined, I asked her to retry the card so she swiped it again, again it declined, I proceeded to pay her with cash as I was late for work. I called my credit card comapny to find out why the card declined when I had a $13.00 balance, they told there had been 2 holds put on the card for $6.34 each from Dunkin Donuts, they informed me I needed to contact the merchant to have the holds released. I called the store and they told me there were no holds put on the card that the card had declined, but 2 holds were put on the card and the lady I was dealing with was treating me as if I were some thief trying to get $13.00 that wasn't owed to me after visiting this establishment for 13 years, I will never go back into this establishment and I thinkv this employee should be repremanded for her treatment of a VERY LOYAL Customer that the store has just lost.