When trying to switch to another provider or even when trying to modify my own broadband/phone package I receive this error.
I was told in the EE shop that my account was not acting as expected and that it needs to be looked at.
Hi @InstoneR I'm concerned to hear that you're getting an error message when you try to switch plans.
Are you having the same issue when you log into your account on both the app and a web page?
Chris S