i had the same problem. i contacted the support, they asked for my phone number and they called me the next day. then after checking my account they told me that the problem is with my payment method but didn't tell me what really is the problem with it,then they asked and confirmed some of my information like my name, billing address, if the credit card was mine, and i said yes, they asked for my domain name etc the then they told me i need to wait 10 business days and they will contact me again after that.
after 10days i received an email saying that my account will remain blocked and they can't give any other information on what the reason is
i searched their forum and found 10+ same issue from the month of February and almost 25+ with the same issue from the month of march,
they're all the same, after creating an account and added a payment method they got blocked.
i added my credit card as my payment before, and now i'm thinking of using paypal as my payment and see if it will works but i haven't tried it yet and i'm trying to find alternative pay ads to use