Faulty Salt Lamp and Unreasonable Refund Policy

I bought a salt lamp here. After two weeks of use, it stopped working. It has a dimmer switch that just makes the light flicker as if it's short-circuiting. I brought it back to the store and asked for a return. They refused to help me because I don't have the original box anymore, even though I have proof of purchase, which is a ridiculous refund policy to enforce. The manager admitted to one of the employees that his salt lamp in his office had the same issue. Yet, they were still unwilling to replace the defective salt lamp. Absurd refund policy. If you do end up buying from here, be sure to keep all your original boxes since you can't return defective products without it.