Can't Unlink Account

Hi! I've recently moved and am trying to unlink my old address/account. However, it tells me that I can't unlink it because auto pay is still set up on it. I went in and disabled auto pay on that account, but now I only see the new account information when I go to billing and I can't switch to the old account to verify whether auto pay was actually disabled. It seems like it wasn't because I still can't unlink my account.