From: United States
This also happened to me. Unfortunately, even though I cancelled my debit card immediately, someone managed to post charges against my account AND created a fake check and cashed it for $200 within 2 days of buying credits here. I don't understand the leap from obtaining my debit card number to having my bank routing and account number, but it happened.
For the record, this didn't happen the first time I bought credits, which was shortly after you rolled out the option to buy puzzles.