Bet2day keep sending me spam email adverts and there is no option in the email that I can see to unsubscribe?

help, how do I report this harrassment and spamming company !! I am sick of it. I get so many every day not just 1 or 2 but like 10 or 12 emails every day and I never registered or asked, I never gamble!!! I tried going to their web site but there is no where to email or ask for help etc just places to join !
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