Seller doesn't reply back

I tried to contact with seller but they don't reply me back
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Ok, why are you trying to contact the seller?  If you have ordered an item and it has not arrived or it is not-as-described then simply go to the resolution centre and open a case:-

 

http://resolutioncentre.ebay.co.uk/

 

If you are simply trying to ask question before bidding and the seller is not responding then walk away, do not bid, just find a better seller.