Myntra.com — locked out of account

I have been a regular customer of myntra but i have been locked out of my account for reasons i’m not aware of. My friend made an account from my phone and got locked out of their account too. Many products did not seem as the picture or did not fit me and so i have had to return it. As far as i know that is the whole comfort of online shopping - to be able to return and exchange clothes at the comfort of your home. But myntra seems to lock people out of their account for doing so.