Assuming you've already contacted him to no avail, you should contact the mods (Ceocards or Floydtown) to let them know of this issue. They have a bad trader thread posted somewhere. They might be able to help you out. -Also, if necessary, they can ban him or Make a note on his profile that he "must send first"
Always looking for Verlander, Cabrera, Maybin, Mike Stanton (marlins), and Avisail Garcia.
*TRYING TO COMPLETE MY VERLANDER ROOKIE COLLECTION. 44/47. ONLY 3 TO GO!*