Fraudulent 1 star review
You can flag the review for Google to take a look by moving your mouse over the reviewers name. Instructions here: https://support.google.com/business/answer/4596773?hl=en
I am sorry to be the bearer of bad news but and this is a big BUT Google ONLY removes reviews that violate their terms of service not based on truth or facts. Their Terms of service prevents things like swearing, promotions etc . Although there is no harm in flagging it if there isn't an explicit policy violation they will not remove it.
You can read their policy here: https://support.google.com/business/answer/2622994?visit_id=1-636181856451953967-2359325100&rd=2