problem with member ply30

dont know were to post this but i sent out a check for a part weeks ago i tried to pm him but i cant said banned on his profile why? any other way i can contact him anybody have a email adress for ply30

As others stated regarding the check to place a Hold/cancel/report stolen etc. I think I would first simply determine if the check has been cashed. If so I don't believe you can do any of the above. If the seller fails to render services or deliver goods I believe that is Fraud and if the Postal service was utilized in the course of this transaction and/or it crossed state lines I think it elevates to a Federal crime.