Hi,
My Monzo account randomly logged me a few days ago and since then I’ve been unable to get back into my account, instead when I press ‘log in’ it assumes I’m making a new account when all I want to get into the app!! I’ve tried many many times and nothing is changing, what shall I do!?!?
Have you tried deleting and reinstalling the app? That fixes most things.
If you are being asked for a phone number, it means you’re trying to open a new account (it catches a lot of people out).
Other than that, an email to help@monzo.com, or a call to the number on your card should get you a definitive answer.
Just to check - are you definitely using the correct email address to log back in?
What were your transactions before this happened?
Are you able to login okay at web.monzo.com?
Everything sorted now 
thanks for everyone’s help!