Pizza Hut

On Easter Sunday, I went in to order a pizza in your Higginsville mo store, I had a 10.00 credit from last time when I had a coupon but didn't use it, had a new girl at the window help me, then another team member came over said couldn't change it, so they gave me a 10.00 credit for the mess up, so I order a pizza Easter Sunday, I order a large pepperoni, going to pay for it she said I own 5.93 even with my 10.00 credit, she said couldn't use the coupon I get in the mail it's a 6.99 large single topping, I said mam why would I use my 10.00 credit, when she charging me 14.99, had a coupon for 6.99 doesn't make sense, I could got a large single topping for 6.99 but instead I use my credit and still paid 5.93, I got rip off, I would like a expection on my it's that way, thanks my name is Stan Collins email is [protected]@yahoo.com