Received a Used Phone Instead of New From N11

Received a pre-owned phone instead of the new one I ordered on N11 from seller Doğuş Planet Elektronik Tic. Ve Bil. Hiz. A. Ş. They had me wait for two months after I returned it before sending an empty box. No resolution was achieved despite multiple support tickets. In a fit of frustration, I have decided to pursue legal action. Tell me what's happening at their warehouse. Why was there a two-month holdup? Their story is that they got a box that was empty. Placed on November 9, 2023, order number 204218717114. No calls, no solutions—the company's lack of accountability is unbelievable.