Hi, I have a similar issue to one I've seen on this forum from about a month ago where my data is being used from my normal plan instead of my roam beyond package. I've been in Switzerland the past couple days. I arrived on Wednesday 19/03 and bought the 5 day package for 10GB. I've been using data and received no warning that I might have passed the roaming cap, but I have checked the app and it says that I have been using data from my normal plan and the 10GB for my roam beyond is still full. Am I going to incur any additional charges for this or is there anyway to recoup some of the data I have used that I thought would have been covered by the plan? I am leaving today so I won't be needing the package for it's last day. Any help would be appreciated, thanks.
Solved
Switzerland 10GB roam beyond data not being used.
Best answer by andewhite
This community article states the folliwing:

Seems it might be necessary to buy the add-on before leaving the UK,
Log in to the iD Community.
Not a member yet? Create an account
Please enter your email address. If it matches our records, we'll send you a password reset link.
Need help? Email CommunitySupport@idmobile.co.uk with your iD Community username.