Myntra.com — product returned but they denied

Hi i placed a return request for jaipur kurti women blue solid trousers for which i received the following message (Return no. :[protected] is expected to be picked up today (9th oct 2018) by our pickup partner (Ph no. : [protected]). Please keep it ready in an unsealed packet.
To check when will the delivery guy will come for the pick up i called on the given number to which he replied he will come around 2:00 pm and said he arrived at the given time. The delivery guy recalled my name and order details after which i handed the packet to him which he scanned with his mobile. After which he left but i didn't receive any return message neither he asked me to sign anywhere. Later in the evening i got a call from another delivery guy who came at my place to collect the order and i told him it's already been collected to which he said ok. But then after few minutes the owner called me and told me that the packet is not received by them and is not collected by any of his delivery person. I narrated the entire story to the myntra executive. Later in the evening again i received a message stating the pick up attempted today has failed and now will be reattempted again tomorrow. I am unable to understand if that guy was not genuine then how come he had all the details. Also the owner told me that the person whose number is mentioned in the message was on leave today. I want myntra to kindly look into the matter and do the needful as soon as possible.