This happened to me when using a credit card at the pump. They charged something, for $99. I assumed they used less than a $100, as that would be a felony conviction, if caught. It was quickly rectified by the visa reps.
I was paying cash at the pump for a while, then switched gas stations with no one in the proximity, of the pump. It didn't happen again. At least, not yet.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).