The link to "customer care" has no way (as far as I can tell) to reach an actual person. There seems to be no way to delete an account. Very frustrating!
Sorry to hear about the frustrating experience. There is a process that needs to be followed in order to delete the Adobe account permanently. A form that will be filled by Adobe Support representative to raise account deletion request.
You may try reaching out to our customer care team via this link: Adobe Help Center . I have also shared support contact number via private message too.