It's possible that your account has been deleted due to inactivity that's why you are not getting any response. You can test this by creating a new account using the same email address and a different password. Do it only if you don't have a significant balance in your old account.
How long does the account have to be inactive before they delete it?
I do have an inactive account from 2016/2017 and it still receives promotional mails to this date