Myntra.com — order marked delivered, but not received

I had ordered 3 tops from Myntra. They were marked delivered on the app, but I didn't receive the parcels. it has been 20 days since this has happened. The complaint has been raised 6 times, every time they just say that you'll get update in 2 days and no information. The delivery boy himself called me and requested that I dont proceed with the complaint else he will have to pay for the refund. After that their logistics team has marked the product delivered without consulting me. I have explained my ordeal to 6 different customer care executives and yet no action has been taken