Reports are not a suggestion box.
The sequence
A person reads it. Not a filter, not a queue that times out.
They look at the listing, the show and the seller's history. One odd description is a different thing from a pattern.
Something happens. The listing comes down, the seller is warned, or the account goes — depending on what was found.
You are told the outcome.
What helps
What you saw and roughly when. If it was in a show, the time. If it was a listing, which item. A screenshot if you have one.
You do not have to prove the case. You have to point at the thing.
If you already bought from them
The money is still held until the item reaches you, and you have seven days from delivery to report a fault. A report about the seller and a problem with your order are separate routes and you can use both.
Reporting in good faith
If you turn out to be wrong, nothing happens to you. We would far rather look at ten reports that come to nothing than miss the one that does not.
Questions people ask
Will the seller know it was me?
No. Reports are not shown to the seller, and nothing in the outcome identifies who raised it.
How long does it take?
Depends what has to be checked. A clear case is quick.
What if the same seller keeps doing it?
A pattern is treated as a pattern. Say if you have seen it before.
Can I report something I did not buy?
Yes — most useful reports come from people who were watching.
More: how to report a seller, counterfeits.