After two years, I was just recently successful in stopping the spam from them.... There's no amount of unsubscribing attempts and phone calls that will stop them from emailing over and over.
I had enough and went on Instagram/Facebook and publicly made them aware of the issue with a promise that I'll create a public art piece that will make them look bad and will go out to literally millions of social media accounts.
Guess what? That same day they contacted me and apologetically manually removed my email....
Yeah... it's disgusting that one needs to go to this extent.