Learn what "there must be a mistake" means, when people say it, and how to use it naturally in English.

It means the speaker believes something is wrong and should not be happening as reported.
From Why I Did It, Episode 29
Someone tries to explain away a problem by suggesting the result must be wrong or mistaken.
Use this when you think there has been an error in a result, decision, or message. It is common and polite enough for work or everyday conversation.
Scenes unlock real expressions as you watch
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