Unfortunately, he's exactly right.
Unless you can prove without a doubt, which would be your duty as a Plaintiff in Court, that he specifically said it was an SVT kit that he purchased from the Dealer you cannot win.
Without a contract stating so, you won't have any chance of winning. I'd just sell the Razzi kit as is and take my losses -- which will be significant. Brand new Razzi kits go on Ebay for as low as $300 as high as $500.
