Manufacturing defect product and different products with different size

I purchased an Emma Queen Size 6-inch mattress through Flipkart (Order ID: OD[protected]). The mattress has manufacturing defects, including uneven corners and failure to regain its proper shape even after more than a month. Despite repeated requests for a return and warranty resolution over the past two months, Flipkart has failed to provide a satisfactory solution. On multiple occasions, technicians closed complaints as “resolved” without visiting. During a subsequent visit, the technician reportedly stated that the mattress measured only 5 inches instead of the advertised 6 inches, yet the complaint was closed without resolution. I request immediate intervention, a full refund through return of the defective product, and appropriate action against the repeated mishandling of my complaint. I am prepared to escalate the matter to the appropriate consumer grievance authorities if it remains unresolved. Please treat this as a formal consumer complaint and provide a written resolution.