I’ve got a Monzo account and I got a new phone transferred everything over but my Monzo won’t let me sign in I can’t contact anyone as there’s no contact number I need this sorted asap deleted the app 3 times and reinstalled it but still nothing !!
What @michaelw90 said or help@monzo.com. You can also try 020 3872 0620
If you can elaborate on what you’re doing, the steps you’re taking, what you expect to happen Vs. what is actually happening we can try to guide you 
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Hi Kelvin & welcome 
Did you restore a backup from your old phone to your new phone (which included the 
app)?
If so, uninstall the app from your new phone, then download and install it, then try & login using the ‘I already have an account’ link at the bottom of the login splash-screen.
Further details in section 4 of this post: