<prompt> Human: A few days ago, went to Arco and got gas. Paid inside because I wanted a snack. Arco only takes debit or cash. Used my debit. Noticed today that my bill for gas was a little higher than I thought it should be. Called the bank to inquire. Apparently 5 dollars cash back had been added to my transaction. Not sure how they added this on I never get cash back, but calling ARCO corporate tomorrow. Went to ARCO today demanded a manager and they gave me 5 bucks immediately without looking at the tape. I now suspect they are regularly skimming their customers. Another reason it pays to watch your statements!  <response>: You should check out and post this to rscams. They like being informed of this stuff, one reason being for people that can watch out for this in the future. 