price challenge

I just started my cashier position at Target a few weeks ago and although I understand about 80% of my job in working at a cash register, I still have a question about how to handle price corrections/adjustments. For example, yesterday I had a guest who bought two Lays potato chips bags in...

So a year ago, our team got pulled in to make sure we understand that if a guest challenges a price on an item that's under $20 we should honor it no matter what and shouldn't actually check the price. Yet the GSA and GSTL still asks for price checks for little things like Halloween candy with...

soo.. im a new cashier and im a little confused as to what I should do when an item I ring up's price is questioned by a guest... for example something rings up as 15 and the guest says "I thought that was 10" something like that... do I change it and put the reason as guest price challenge? it...