I won't call you any names, but I wouldn't have done the same.
You should always point out the cashier's mistake, however small. They're only human.
If pointing it out doesn't work, then EXPLAIN the mistake. You just asked him to check if he got the right item, and he obviously doesn't know where to look. If you would have explained it to him, it would have been solved. And you would have felt alot better about yourself.








