Defective product and poor service

Bought a defective product online, reported this and it took several week ls to respond to the initial ticket logged, thereafter i was advised to go to a physical location for someone to look into this and confirm it's defectiveness, I did as instructed and when I arrived I was told by the representative that I needed to print out the receipt emailed to me for them to confirm the purchase, the rep then proceeded to tell me that the product was not defective but empty implying I used it and could not tell it was empty. The attitude of this rep...distasteful. I received an email where I had to provide a product code and to date no reply still