Missing Money *****ED by paystack and under armour

I made a online purchase with Under Armour and the payment went through but I didn't get what I ordered. I complained to Under Armour online Customer Service, they feedback was pay stack could see the payment and that it bonused back, after providing proof of payment and bank statements to show the money didn't bonus back , and that paystack should show me proof money bonused back , they change their story, now paystack claims that they don't know the account linked to Under Armour online yet first feedback was they could see the transaction . Can I get a definite answer as to what happened to my money money don't just disappear.