My debit card was used as credit and that transaction never existed in my checking account. What happened?

by dbootcamp08
Question by : My debit card was used as credit and that transaction never existed in my checking account. What happened?
Ok I first used my debit card as a credit card because the cashier didn't hear me say debit.
She refused to swipe it again because it was approved anyway, so I let it be.
I checked online for the transaction and it never existed, so I pretty much got away with that $ 5 purchase.

However, I've shopped online for Christmas and used my debit card, but now for

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