Hi and Welcome to the forums!!
What was your credit limit? FP usually has fee's to open the card...so, by the time you active the card, your credit limit is like half.
So, depending on your limit, and the initial fee's to open the card, your purchase may have gone over the available credit left on your card.
How much was your purchase?
and, once you make a purchase, and then cancel it, sometimes it take 24-48 hours to reflect that.
I believe you should have read the TC of this card/bank before even trying them out. As many of member had mentioned before, stay away from this type of cards. There are so much more better cards.
Welcome to First Premier, one of two **bleep**tiest lenders on the planet. Other one is Credit One(not Capital One). If you look at your account you will notice most of your credit line has gone to fees and depending on your initial credit line that can be a huge part of it. Most real lenders do not charge you any fees to open acounts and the ones that do only offer a annual fee. First Premier and Credit One however like to charge for anything under the sun. I recommend closure and starting by finding a real lender.