Myntra.com — I have returned the item but it is not updated by pickup agent as delivered..after that I got message as pickup cancelled

I have raised concerns in Myntra..but without resolving issue the are closing..pickup agent has picked up the product but Myntra is saying we have not received the product when I raise the concern they are asking for delivery agent mobile number, name receipt which is given on puckep..I have been shopping on Myntra from past 5 years I never got delivery agent name and never received a receipt when I returned the products..they should have tracking for every who delivered and who picked up items..they are asking customers to share those details which is not possible..even mobile number also not possible as I got call as company call which I couldn't call back ..this isuue is closed without any investigation IN[protected]