Email SPAM

I have subscribed to their mailing list but since then I get anything from 1 to 3 emails a day from them and it's getting a bit much now. I've UNSUBSCRIBED from everything from them so many times and still no change. I even sent them a mail to please take me off their mailing list, which they rep**** to and said they'll look into it in the next 48hrs. It's been a week now and still they spam my mailbox. Quite frustrating and I don't even feel like supporting them anymore.