We can't name and shame other sellers, so expect your post to be censored pretty soon.
You can REPORT the scam to the Security Centre at the bottom of this page.
You will get a polite reply.
They will not remove a seller on report from one member. There will have to be several reports before they will take action.
This is because the single report may come from a competitor, a vigilante, or just be wrong.
Several members reporting is needed-- and of course the wave of Disputes from cheated customers.
Did you open a Dispute in Help and Contact?
The most efficient is the automated centre which is also quite fast, with a normal turnaround of less than a week.
What is the scam they are running?
Did you get your refund?