Dolce & Gabbana Glasses Defect! Scratched Lenses & Useless Warranty!

I bought a Dolce Gabbana eyeglass from Atasun Optik, but the temple part keeps touching the lens. I brought it to the optician, who verified that it was a manufacturing defect. Because the temple keeps touching the lens, it's getting scratched. Even after replacing the lens a week later, the same problem happened. Furthermore, the glasses are experiencing issues with the coating. Even after multiple visits to the store within the warranty period, no steps were taken. Since the warranty is no longer valid, I had to pay for a new lens out of my own pocket. I need help with resolving this issue.