Declined 76561198076308540 (Марцинкевич)

VICTIM:
|steamID: Sinistro™
|steamID32: STEAM_0:1:20672196
|steamID64: http://steamcommunity.com/profiles/76561198001610121
|customURL:
|steamrepURL: http://steamrep.com/profiles/76561198001610121
SCAMMER:
|steamID: Марцинкевич
|steamID32: STEAM_0:0:58021406
|steamID64: http://steamcommunity.com/profiles/76561198076308540
|customURL:
|steamrepURL: http://steamrep.com/profiles/76561198076308540

So here's the story: I was selling a N&B Unusual Geisha Boy for 14 keys. I posted a trade in TF2Outpost. Suddenly, this guy added. He said that he offers a Stormy Storm Glengarry Bonnet. Sure, I accepted but then, he added some weps stuff, after that he asked me to add 5 crates. I did it, we made the trade but then, I realized that he swapped the unusual into a dirty unique one... He directly removed me from his friends list at the end...
So, please, Help me ! Thank you !
From : AymanMs A.K.A Sinistro™

Please take picture of trade history and post.
Thanks

Sorry, but I did not take a screenshot of the trade...

Go to your inventory then trade history ( top right) and you can see all your trades.

Vous avez fait un échange avec Марцинкевич. 13 h 05

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L'Overdose, Le Rafraîchisseur, Métal recyclé, Bonnet Glengarry​

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Caisse Mann Co., Caisse Mann Co., Geisha Boy (Inhabituel), Caisse Mann Co., Caisse Mann Co., Caisse Mann Co (Sorry I have Steam in french :/)​

Hello, I would appreciate a screenshot of oyur trade history.

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There it is... As for the trade chat, I didn't take a screenshot of it... Sorry...

First, I thought that in the new Steam Trade System that we can't switch quickly... But apparently, it is.... Thanks anyway for your advice, Charles Bronson !