Spam emails

I made the mistake of subscribing to Builders Warehouse in order to get an idea of the Black Friday deals. However, due to the high volumes of emails received by them I decided to unsubscribe. Yet, the emails did not stop. I unsubscribed 5 times. It is now 3 weeks later and I still receive emails each and every day. I wrote them an email saying I am going to report them to consumer services. It comes as no surprise that they ignore the email and the spamming continues non-stop.