I have same issue with digitalocean, and I find that this problem is pretty widespread.
I can’t buy a droplet so I contacted support. After providing all the information they required, they decided I’m not worthy to use their service, so they locked my account.
I asked them to just delete my account, since my credit card info is still there. My account is not deleted, and they never reply to me again.
I have heard stories of people whose credit card is charged one year after they stop their service, I just hope I am not one of the victims.