We appreciate the feedback, and we understand how hard this is for the owner of the account. However, we have a process that we need to follow from the back end to reactivate them. That's why it's important to reach out to us once they have already done the following:
1. See if the email they originally complained about is in their spam folder. If so, move it to the inbox
2. Add the sender's email address to their address book (safe sender list, allowlist, etc.)
Once it's done, kindly ask them to send you an email stating that they would like to re-subscribe (showing their email address as the sender); then, please provide us that screenshot so we can escalate to reactivate them. You can always access the list of subscribers marked as complained on your subscriber's page>> click on "confirmed subscribers" then choose complained.
If you have further questions, I recommend you email firstname.lastname@example.org to take a look at your account.