Has this self-checkout charged me twice for the milk?

How to say “Has this self-checkout charged me twice for the milk?” in Japanese

In Japanese

このセルフレジ、牛乳(ぎゅうにゅう)の代金(だいきん)が二回分(にかいぶん)になってない？

Kono serufu reji、gyuunyuu no daikin ga nikai bun ni natte nai?

Has this self-checkout charged me twice for the milk? in other languages