In-Game store overcharged me?

Yeah, I know these aren't the official forums, but before I go to support or the bank I'd just like to know if I missed some sort of standard protocol.

I purchased EotN today (using a debit card) to celebrate being done with finals. Being a full-time, live-at-home student, I'm pretty close to broke, but I transferred about $40 to chequing before I purchased it. When I decided that I might want to check if I still had enough remaining for a character makeover, I found that I now have somewhere around -$70 in my account. As I checked the amount remaining immediately before purchasing, I'm a little confused. Did the store just charge me multiple times?

The only reason I feel the need to ask is that I've read something about how certain stores place a sort of temporary charge that is removed after a period of days or weeks, although I could be misunderstanding this completely.

Yes, I understand that to anyone with the least bit of financial experience, this is probably a stupid question. Regardless, any advice would be appreciated.

Check your buying logs, see if something happened.

Yeah, I plan to. Unfortunately my bank's crappy site won't let me do that online, so I have to use the phone and wade through 15 minute's worth of mechavoice or grumpy representatives.

Log in your NC Soft account and go to Account options. Go to Billing and see the transaction.

check your email that is attached to your ncsoft account when u purchase anything from the ingame store they also send u an email make sure to check bulk or spam email

So you put $40 in then when you check later you have $70? Sounds like a good deal to me.

I'm pretty sure he said -$70, as in, he was overcharged and is now in the red. Talk to your bank as soon as you get a chance.

Yeah, what I think happened is that the badly coded online store timed out but made the purchase anyway, so when I hit reconnect it did it again.
Then my bank charged me overdraft.