Hi jemma157,
Welcome to the Apple community where some of us do our best to help each other :)
Sound like you might need to log-in to your Apple ID and check your details are ok.
Could be something simple ... perhaps your payment method expiry date has expired ... or such.
Apple ID Log-in:
https://appleid.apple.com/
Hope this works for you :)
Else:
You can try resetting your password from any trusted iPhone, iPad, iPod touch from the link below::
If you forgot your Apple ID password, or have issues when you try to sign in :
https://support.apple.com/en-us/HT201232
If you did need to reset your password for any reason:
What to do after you change your Apple ID or password:
https://support.apple.com/en-au/HT204071
If you still need help:
Apple ID Support Page:
https://support.apple.com/en-au/apple-id
OR
You might want to contact Apple for support and service:
See a list of Apple phone numbers around the world:
https://support.apple.com/en-us/HT201232
Cheers :)