I received an email from a website I don't remember signing up for, and have no clue what they do. After a few attempts I am able to log in. I go through menu after menu looking for the "permanently delete all my data" button only to find an FAQ that says

"Q: How do I delete my account?"

"A: Please get in touch with our Customer Services team if you have any worries or concerns. If something at {website} has troubled you, we'll be happy to help sort it out."

To their credit, the support chat person was very efficient in complying with my request.