This is a somewhat common occurence.  In some cases, there is an error or problem with the debit or credit card, and the DSi Shop, Wii Shop, and 3DS eShop is still able to put a charge  on the card even though the transaction was unable to be fully completed  and the appropriate Nintendo Points were not given.

But  do not worry about losing your money, because your card still  says that this is "a pending transaction", most likely in 24~48 hours  this transaction will automatically expire and no money will be charged to your card.

But  if for any reason there is money debited, then please call Nintendo 1800-255-3700 (6am-7pm, Pacific Time, 7 days a week),  or use their webform to contact them, and they will immediately refund your money or credit your DSi Shop account with the Nintendo Points.

for this issue, you should contact nintendo at 1-800-255-3700 or email them using their webform. they should be able to give you your money back or get you your points.