I don't speak any French at all, so I just tried running your customer's comments on Link hidden: Login to view
and this is the translation I got:
'Very Bad instrument without interest-gadget with tourist-shame with you'
Its sad how just one negative can destroy your eBay status, but there are a few things you can do to overcome this. Try reading this blog, you may find a few helpful tips in there.
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Hope this helps. Cheers! :)