Myntra.com — Part of my orders is missing at the time of delivery

On 17th Oct 2020, I made a shopping for eight items vide order no-1154800 [protected] and opted for prepayment. On 29th Oct, I got an alert message that your deliver agent will bring my four orders including one Mast and Harbour blue skinny fit jeans, W women rust orange kurti, Blackberrys Men navy blue printed sweater and puma shoes (screenshot of the message enclosed). But when I opened the package I found only one item i.e. Puma shoes and the rest of the three items are missing. I raised query on Myntra app many times but they close my issue as resolved without actually been resolved. This is happening with me for the second time. There is a problem somewhere either the myntra packaging team has done something wrong or the delivery agency has done something. I need to know why my items are lost and who will be held responsible for this.