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I'd find a new supplier. I'd make the old supplier know it too.
I agree with KGB. I would be very frank and tell the supplier of your experience and just maybe he too is being played by the very same buyer.
If they do offer you less than you paid, I would decline to return the items if you believe you can eventually sell them yourself without a loss.
Sometimes the experience will be the benefit for you to have learned how to protect yourself in the future. It may not be worth doing anything and just move on putting the experience behind you.
There will always be buyers who create issues which end up not being a good experience and often blocking them or not dealing with them again is all you can do.
Good luck in whatever you decide works best for you.