Photo by neilt.
Apart from suggesting that you use a credit card instead of debit whenever possible, the author points out that the one rule of thumb for using a debit card is to always, always, always ask for a receipt. This is all the more important where larger transactions that detail multiple items are concerned. Receipt in hand, the first step is to call the merchant. If s/he offers to call your bank for you, step in and do the calling yourself, then conference in the store manager/owner if needed. It is important that you cut out the middleman and remain directly involved throughout the process.
Browse the post for the full details and, if you've been hit with an improper card charge, tell us how you managed to resolve the error in the comments.
Disputing a Debit Card Overcharge in a Hurry [Examiner via Consumerist]
