Return and Refund Request for Defective Headphones

I requested a return and a potential refund for my headphones, which I purchased online on August 29, 2024, and received on August 30, 2024. Unfortunately, after only a few days of use, I noticed a significant change in sound quality and discovered that the headphones were broken on September 4, 2024. In the email they sent, they said a technician would come today (Wednesday 11/09/2024) to assess the product but I haven't received any call or communication about that, no one came basically to fetch the headphones and I have been waiting. I am very disappointed in their customer service.