Short questions:
Did you get the units, as are they in your possession right now?
Do they work at a full hash rate without strange noises and don't change out of the blue the pools they mine or the username?
In that case and of course excluding other shenanigans, yeah, it's a deal, end of march I saw kaboom selling the M31S+ for 5k, no clue about those Goldshell.

You haven't got them but you paid for them upfront, just please tell me it's not the case.