I complained to Etsy about a seller who I believed misrepresented the product he was selling on their platform. Etsy never investigated intead, only stated that the complaint would be put on seller's file. I lost cost of shipping the items back to seller.
Also once items are returned, Etsy website doesn't allow you to review the product. I therefore couldn't warn other unsuspecting buyers about this particular seller.
If you are a buyer please avoid the platform because you wont get that much protection from Etsy.