Myntra.com — product is wrongly marked as delivered

Hi,
This ia regarding my 2 products which was pickedup by myntra tailor for alteration and after alteration it was supposed to on same day only.
But i was not available at my flat so delivery boy marked it as delivered.
And when i contacted that delivery boy and he stated that ur manager told him to do so and asked me to talk to his manager. I never experienced this kind of modern fraud by any e-commerce company.
What should i do now?