The same company which allowed a user to use my own email address to create an account without even verifying their email address? The same company spamming my

The same company which allowed a user to use my own email address to create an account without even verifying their email address? The same company spamming my email address with a newsletter which I can't unsubscribe from? The same company where you contact their DPO and they won't reply? Yes, I've heard about them...