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Sounds like a cash back credit. Or have you returned anything to Verizon lately that may have been bought on that card. A phone charger or something? Hmm not quite sure. All you can do is call in and double check .They'll tell you. Their customer service is great.
I know this was posted back in February, but I'm currently going through a fraud situation and my bank manager told me that sometimes thieves will make a very small charge on a card or account to see if it's an active account. I hope that this is not what happened with your card, and I understand it was a credit not a debit, but it still got my attention and made me wonder.