Tom Thumb

We read the sign on the lays chips " two for $6.00 ten to 11.5 oz " so we bought two . We went to check out and was rung up for a total of 7.78 . We told the checker the sign said two for six any flavor ten to 11.5 oz. he told us yes there on sale but didn't know why they were ringing up for 7.78? So instead of fixing the price he swiped my card and then stated I'm not sure how to put the refund back on e.b.t. So we told him I would complain he told me to go ahead...