Game Mechanics: Lost 1500 plat on a cancelled trade

[Unbreakable]

Hi I went to trade with someone and the trade got cancelled and I lost my 1500 plat, it didn't go back into my inventory for some reason. Not sure where to go from here, was wondering if there's any way to get my plat back?
Character name is Delwen, was trading with Berryblend at tunnel around 5:20 to 5:30 pm Pacific time. He said he was pressing escape repeatedly to get out of all his tell windows, and he didn't have my plat, which I believe because it said the trade was cancelled.

Thanks.