Double Dipping

There are some things money can't buy. For everything else, there's Mastercard. The only problem is you may have been charged double if you used it recently.

A spokeswoman for the retail giant's electronic payments processor says shoppers who recently used their Visa or Mastercards may have been double or even triple-billed.

A computer glitch affected more than 8 hundred thousand credit card transactions nationwide.

The spokeswoman says the charges have been reversed but may not show up in some accounts until Tuesday. She says shoppers should check their credit card statements.

If you think you may have been affected, you can call toll free 1(888)893-0626.