Other Seller on your website boost up Negative Feedback for me

https://www.playerup.com/trade/solotfo.1561136/?reloadList=1&amountFilter[0]=-1

Absolutely brazenly, one of the other sellers increased the negative reviews for me in the market. I haven't even managed to sell anything through this market or anywhere else yet.
Delete it all and ban the one who did this to me! I just started using this site, recently registered.
Why does moderation skip all this - these negative reviews that are clearly misleading?? A brazen increase in negative vouchers from some freak who doesn't want competition.
I'm sure this user https://www.playerup.com/xleb.739208/
is doing boost up negative feedback to other sellers, since he left his feedback, including from his account on which he sells the same as me. Naturally, there was no deal with him, no one had time to write to me yet. He's caught. Ban him, he breaks absolutely all the rules!