Got sent this in error by a scrapyard and it doesnt look like they'll be giving me a refund so...
Fully working gearbox to fit W reg micra 1 litre (998cc).
I don't think so, you can claim via the bank for non receipt of goods or faulty goods however you will need the proof in writing that the company refuses to take the gearbox back.
What you can try is looking up the Distance sellers act