My local street vendor no longer sells sweet mangoes… so I hand picked some in Big C, weighed, swiped and checked the price. I was charged about 120 Baht per kilo instead of the 90 Baht displayed price! The young lad checked the displayed price and issued a revised bill.
I’m now wary of the ease it is to be incorrectly charged
i also make a habit of checking change. I once returned 1,000 Baht and never forget the look on the cashier’s face, priceless ????