Myntra.com — reverse pickup done but now denying it

Address:	410210
Website:	myntra

I got a message in the morning that my product will be reverse picked up today, a guy came and asked for the myntra return package, i gave it to him, now i am informed by the delivery people that product has not been picked by them if its a 3rd guy whom i gave the package how does he know there was a package to be picked by from my house. Getting cctv footage and filing police complaint for sure