How to get refund whne seller refuses to provide a return address

Hi bought ;

Delivered on Wed 24 Jan
Return window closed on 23 Feb.
AU $300.53
Sold by:
 
 
I had it for literally 6 weeks when it stopped working... have tried talking to seller but nothing.. offered me 30% refund... no way ... spoke to Manufacture and they said its faulty and a bad copy from China.
I have asked 25 time for seller to provide a return adress and he won't. Keeps saying once returned then will refund... I have know checked others complaining on the sellers site that the same thing happened to them.
He even removed my option to return and also to provide feedback... I have tried everything and am not happy as currently $285 out of pocket with a bad copy from China. 
Please help as it is alot of money and so unfair. 
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Why doesnt Ebay stop them from trading.... they are abviously scam artists?