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 can either hit report SPAM which may stop further emails or you can guarantee you never see another email from them again by creating a gmail filter. To create a filter inside Gmail, all you have to do is click the drop down arrow on the top right of the email itself and click on “Filter messages like these”. After that you will be presented with options like “send all emails to trash or spam and apply the same action to past messages in your Gmail folder.”
Read my other article on full steps on how to apply filters to have people or companies stop emailing you. Some companies over email people and it gets annoying having your smartphone notifying you constantly of new emails from same companies.