i just found a reddit thread about this problem it may be old but it shows how old this problem really is and that bungie has heard about it before link bellow:
https://www.reddit.com/r/DestinyTheGame/comments/2nkywd/encountered_my_first_hacker_in_pvp_today/
English
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Interesting. I think the 'Immune' message only came up that one time during my match with him. I wish I saved my POV, so I could look back at it. From the beginning of the video, that was the start of a 10 kill streak for him.