Hello.
It takes time to get the Account active.
Contact the support
Go to: https://developer.apple.com/contact/#!/topic/select
Select the "Membership and Account"
Select: Program Enrolment
And provide them all of the info from your Invoice.
Include the information that you paid but account hasn't been activated.
Ask if there is any problem with your account and what else you need to do.
Just be nice and do not talk like they own you something.
They have lots of manual work to do, so it takes time.
Have a nice day
Topic:
Developer Tools & Services
SubTopic:
Apple Developer Program
Tags: