My friend gave me a $25 Visa Vanilla gift card for my birthday. I was making a purchase for approx $55 and asked the merchant to put the gift card toward the purchase. When she put it through, it paid for the entire purchase. The next day I went online to check the balance as I was a little befuddled as to why it would have paid for the whole amount when it was clearly only a $25 card. My card still showed a $25 balance. Thinking there was a mistake made by the store (it was out of state, not someplace I could easily get back to), I decided to use up the $25 still showing as my balance and throw it away. Now all the charges are showing up on the card. My question is: Who do I pay, and how do they know who the heck I am? I made my last purchase on Amazon.com, so they could feasibly trace me if they really wanted to, but if I hadn't done that, how could they possibly find me to bill me?? What might the repurcussions be if I don't do anything? I'm inclined to just pay off the $53 I owe and be done with it as I don't want them finding me in 6 years and telling me I now owe them $600 due to some crazy interest rate. Any feedback or advice? Thanks!