O2

The link to claim 6 months free Apple Music isn’t working to redeem does anyone know why

I have upgraded and supposed to have Disney plus added free for 6 months but it won’t add as an extra I have been on hold to customer service for 1 hour who then puts the phone down saying they don’t understand me !!

How do I add Disney as extra I got it with upgraded phone when I go into extras it just says oops something went wrong! Cannot get to speak to anyone