Thanks for reaching out to the Apple Support Communities.
I understand that you are unable to activate your iPad after it automatically updated over two weeks ago. It's important to make sure that you can use your iPad, so I'm happy to provide some support.
I suggest following the steps in this support article:
If you can‘t activate your iPhone
Even though this says iPhone, it will help with activating an iPad as well.
Let me know if you have any questions.