Seller wont refund my money having sent me a different item to which I ordered. I returned item with address given by them and item was returned back to me with no explanation.

Please help. I have tried to resolve a matter with a seller amicably and in vain. Please help. | Buying

Please help. I have tried to resolve a matter with a seller amicably and in vain. Please help. | Buying | eBay Australia