Unable to login payzapp

Few days back, I upgraded payzapp app on my mobile and the new version (v4.00) denied log in saying my phone is rooted. I searched for old version apk (v3.14) and was using that version since then. Today the app said that I needed to upgrade to latest version before login and new version again barred my login saying, it’s a rooted device.
I am using Redmi note 5 with unlocked bootloader but without root.
Any suggestions to help me login ???