I am trying to upgrade my account for a single domain but failing to do so from 5 days. Can you guys help me. Showbox apk
Do you get any error message?
If you cant set a payments method or something like that you need to open a ticket.
I already have a verified payment method but not able to upgrade something like Internal Server error is showing below the screen.
In which case, you should probably contact support using the link that @MarkMeyer provided