Terrible customer service!

Terrible customer service!
refuses to exchange or refund an unused product because the box was opened while it was during the purchase that the seller opened to check that there were the accessories in the pack. Everything was still packed inside although it is written in their condition of purchase that if the product has not been used it can be refunded! Really run away, they are dishonest !!! Their only answer is "it's you who says it all you have to do is go to the store where the product was purchased" so how do we do if we don't live nearby? in short, lamentable, it is a long time ago when customer satisfaction was important.