Most owners who want a review gone report it once from their phone, pick a reason, hear nothing for a week, and give up. The review stays because nobody made the case. Google is not judging whether the review is fair. It is judging whether the review breaks a specific written policy, and a report that does not name one and show it is easy to dismiss.
So the work is the case, not the click. Which category applies, quoted from Google's policy. What in the review or the account points to it. Whether there was ever a customer by that name on that date. The difference between "this is unfair" and "this reviewer has never been a customer and works for the shop across the road" is the difference between a report that gets dismissed and one that does not.
And some reviews are not coming down, because they are honest. A real customer who had a bad experience is allowed to say so, and trying to remove that review wastes the one appeal and, done the wrong way, is illegal. That review gets the best public reply you can write, because the next customer reads your reply more carefully than the complaint.