CAN Someone from Stuff HELP???

Big scammer on record, keeps buying my stuff opening a dispute immediately, and not reposnd to messages !!!
https://gameflip.com/profile/us-east-1:ecb82cd7-0d50-4c83-9a34-9911fe0f4736/sir-alex THATS HIM
Please help,
I am gonna lose my 70$ for nothing…
I’v blocked him in order to stop getting disputes !!