so you can't do much, except remind the company that you purchased the drive from them. You'll have evidence of that, although it will simply prove that you purchased a drive - not that you purchased the particular drive they now have in their possession.
Let's explore the possibilities:-
1. Aria have deliberately supplied you with a forged drive.
2. They have inadvertantly supplied you with a forged drive.
3. The drive isn't forged at all - Aria are lying.
4. You're lying - you returned a forged drive that you bought somewhere else.
5. Nobody's lying - the drive isn't forged at all.
I think we can discount 1. 3. and 4. - which leaves two possibilities:-
If the drive is really forged, and Aria have inadvertantly got hold of a batch of them in some way I would expect them to have received more complaints/returns, and you could always put that to them.
If the drive isn't forged one asks oneself why a reputable company like Kingston would say otherwise. That leads us to the conclusion that the drive may well be forged, and that Aria have in some way been supplied with it/them.
You need to press them on these points - a company that cares about its relationship with a regular customer will want to resolve this as rapidly as possible - it's in its own interests to do that.