Create a filter for all of their emails. it wont go to a spam folder but an athletic folder. either way its out of sight, out of mind. and they are a young business so getting a huge social media presence is basically a requirement for survival. My question for you though is, do you read article on the Wings, or other sports teams regularly? if you do consider just using one of those 60% of or whatever deals. I think you would actually like the product. However, if they have already gone too far in your mind I get it. I promise you I am not an athletic bot. just look at when I signed up for this site for proof.
I understand that your extremely frustrated by seeing their ads all the time. it can be really annoying, and that sucks. have you considered and I know this seems a bit extreme, but have you considered creating a new email account. I did this couple years ago, and moved over only the contacts, and accounts that I considered really important (bills, funny enough my athletic subscription, ect..) and check that daily. I still use the older one, but only for generic sign up stuff. It takes a few minutes, but it was worth it for me in the end.