outlook blocking problems

I have a sender who refuses to remove me from their mailing list and I have tried everything to stop their emails from ending up in my inbox. They're already on my blocked senders list but the emails keep getting through. If I mark them as junk the next one still goes into my inbox. I'm getting really frustrated. Does anyone know how I can get rid of these people without having to report them to the CRTC. The blocked sender function should be keeping them out but it isn't. Any solution would be welcome. Thanks.