@jasbinderkumar , if you are having difficulties with the app, have you tried uninstalling it, rebooting then reinstalling it to see if that makes a difference?
You may need to ring customer service to get them to reset your account to see if that makes a difference.
You can also view your bills by logging in to your account via the website.
If you cannot see where to find your bill in the app, click on manage at the bottom then click on payments and bills and then the one you want to view, which you can also download. You can also do this via the website when logged into your account, there is nothing wrong with the app.
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using web based app or another phone: +44 800 079 8586 or +44 800 956 6000.
