Monade
6
Hinata, check if your account is frozen or not - main page after you log in.
It seems Funcom automatically freezes accounts when you update your details, your payment options or change your membership status. I heard also some people have issues when they buy a digital copy of The Park - their payment is approved but they receive no mail with all necessary instructions to download the game. It is possible this page no longer works correctly.
I opened a petition in game as I am facing the same issue - unable to reactivate my account, loss of my lifetime member status benefits. You should do the same.