Rust And Stains Appeared On My Electrolux KGG64362K

I purchased an Electrolux KGG64362K built-in hob from the MediaMarkt website on 5 October 2026. Delivery and installation were completed without any issues. However, about a week after I started using the hob as intended, the grates, burners and burner wells developed discoloration, rust and stains. As soon as I noticed the problem, I contacted an authorized Electrolux service center and followed the cleaning instructions I was given. Despite this, the marks and stains did not come off, and after only about 10–15 uses the hob began to look as though it had been used for years. I therefore requested a return on 27 October 2026 and was asked by the service center to send photographs of the hob, which I promptly provided. To this day, although 13 days have passed since my return request, I have not received any concrete outcome from Electrolux despite calling customer service five or six times. Each time I was told that the issue had been marked as urgent and that I would receive a call back as soon as possible, but no clear solution has been offered. While this uncertainty continues, I have to keep using the same hob. This process has seriously undermined my confidence in Electrolux’s product quality and customer support, and I am concerned that other customers who experience a similar problem may face the same slow and ineffective handling. I consider this hob to be defective and request that my return be processed as soon as possible and that the full purchase price be refunded.