I want to stop recieving marketing emails now, not in 48 hours. NOW!

I'm getting these stupid fuking marketing emails/onboarding emails and I do not want them. I want to unsubscribe now, but when I go to unsubscribe- I'm instead told that it will take 48 hours to unsubscribe?

This kind of s**t is unacceptable. It's an automated system that should be able to update my preferences IMMEDIATELY. I want someone to kill these emails now- I do not want to continue receiving them- not even one more. Seriously. Unsubscribe me from these fuking emails.