This is good experience working on fiverr
You need to remove the username immediately as naming and shaming buyers and sellers is not allowed on the forum.
In addition to what @lloydsolutions said, this is forum, not Customer Support. We’re just sellers and buyers, and we can’t “take action” against this or any other user.
If you have a problem with your buyer, you’ll need to submit a ticket to Customer Support.
Sorry for but next time i will keep things in mind before posting here