Myntra.com — Account/login issues - Critical !!

From Monday 28 Nov. I am trying to access my account using Myntra app but it is re-directing me to 'browser login' page like a First time user.
I am using this app from few years and have approx._500 orders in history but not able to access/login to my account at all. Every time it is taking me for 'Sign in/Login' page in browser and not opening app in my mobile phone. I have even tried using 'Forgot password' link but it is also pointing again to 'Sign in' page in browser.

Please help asap, it is very CRITICAL as have lot of orders to track and return. Thank you!