Welcome to the Community, @Bm63saw.
If you have the EE app, you should be able to see the amount of time remaining on your tech add-on by selecting Manage > Mobile & SIMs > Select your number > Add-ons and Extras > View all add-ons.
This won't mention the amount left to pay, but if you give us a call, they'll be able to confirm this 😊
Peter
