First time dealing with a grey dealer - delayed payment

[RRJ]

Hey everyone! For the first time in my watch collecting journey I decided to sell off a piece I just wasn't really wearing anymore, my previous gen Daytona Ghost.

A grey dealer took my watch in on consignment and sold it on the 25th of june and apparantly received the payment either on the same day or shortly after. I was told I'd get they payment minus cost for polishing but got no date confirmation. After following up continously he called me today and apologized, apparently I needed to sign a purchase agreement instead of a consignment one since the agreed upon amount was slightly lower in the final sale (I knew of this and agreed to it).

Since this was my first and most definitely last time doing business with a grey dealer, is that normal or to be expected? The grey dealer had an immense inventory and some pieces from GF and MB&F I was really interested in, in general they are very reputable, especially in Switzerland.