Myntra.com — Myntra credit fraud

My Myntra credit had around Rs 2500 . Recently when I checked to order something I saw there was already two orders placed on Mumbai address while I live in Bangalore and all my Myntra credit is gone. Also my email adress is also changed .i never received any notification regarding email update or order notification on my phone and email. neither I shared any OTP. I have raised complaint to them to some senior call center guy named Stephen.he raised a complaint numberIN[protected].
Not sure when they cannot keep our money safe why do they not transfer to our account and keep there wallet.