Luxstyle International Luxstyle demanded payment for a product I hadn't ordered. Denmark Internet

I visited Luxstyle International site to see how much their eyelash serum cost compared to other sites.  When I saw how much it cost I quickly exited the site and did not order the product.

Subsequently they sent me two lots of eyelash serum which I told them I was returning as I hadn't ordered the product ad didn't want it.  They assured me this was fine and the serum was returned to them 2nd class through Royal Mail on 30th November 2016.

I received a letter from Denmark yesterday (21/12/16) back-dated to 13th December 2016 stating that I now owed them £78.84 for a product I didn't even want and in addition, as I was late paying for their unwanted product, they had imposed a £10 penalty fee!  Cheeky bastards!  They are now demanding that I pay within 10 days or they will threaten me with debt collection.  They can get stuffed!!