Myntra.com — In app package states delivered, but no package receive till date

I have ordered a roadster jacket from Myntra along with three jeans and one top. One of the delivery agent came and delivered me three jeans and one top but when I went through my app. It's showing that the roadster jacket had also been delivered, and I have never received that product. I have raised this issue with Myntra and the team asked me to wait till 2nd Nov, instead of resolving my issue again they are saying to wait 48 more hrs. I need help on this. Kindly escalate this issue further so that they cannot fraud people this way