Myntra.com — invictus shirts

This is regarding Myntra purchase which was fraudulently done from my account, a person named Deepak with delivery address Near Vaikuntam Wedding Hall Tc 37/761 west Fort, Thiruvananthapuram 695023 Kerala
Mobile no [protected]
This Person has made a purchase of Invictus T-shirt from my login and has got it delivered to the above address, he has made use of my existing Myntra credit of Rs 398 dated 22nd March 2019

Order no 110515450730077003503

When I made a complaint to Myntra about this on 25 to March 2019; they said since product delivered we cannot do anything, file a complaint with cybercrime.

Is there no security in Myntra for our purchase bank details