Can't play purchased game D2:R

I bought D2:r and then found that my PC didn’t meet the system requirements.
Now I can’t play this game, but I can’t exchange it either.
Is it possible to get a CD key for the Diablo2 Classic LOD and link it to my account? I still have this game at home, but without a CD key.

My Battle.Net name on Diablo 2 LOD is “Kassini34”

This is the forum for D3. However just request a refund via ticket.