If you unsubscribed yourself via the unsubscribe link in the very bottom of their email, and you see yourself still receiving emails from them, this is what you can do.
If you are a Gmail user, you
emails
How to Set Up Email in cPanel
Log into your domain that is using cPanel. You will see a welcome screen with all of your options that you have.
Click on your Email Accounts icon to get to the screen where you create your