Xbox using wrong email address

I have got an issue with xbox using an old delete alias. when signing in to say rockstar or Activision. it's is stressing me out now because xbox support is appalling and now I can't unlink my xbox account from Activision because I don't have access to the email address.

All I want to do is speak to someone at Xbox but it seems to be impossible. The request a callback never works.

:)