I am tired of receiving emails from Groupon!!!

Yes I have tried to de register, yes I have tried to contact Groupon multiple times! And yes they are popping up in my spam folder now! When i tried to de register they told me my email wasn't on their mailing list. Yet I'm still getting emails? i love the Groupon service. but hate all this emails. It is now bordering on pestering! All i want is to not receive all these stupid emails, is that to hard to ask?