You can unlock your account through the Monese app, however you will need the identity document that you signed up with. Once locked out, just follow the instructions in the app.
If your account is still locked, please check your registered email for recent messages from Monese or call +44 (0) 1706 304 001, Monday through Friday 8am to 5pm, so that a customer support specialist can assist you.
For international contact numbers please check https://monese.com/call-us