I would confrontrecommend in a discussion with the user's and let them knowother moderators that I know they have been cheating on theirall reputation and have gained hundredsfrom their cheating be removed and that an additional amount of points for it let's say 1500reputation to be determined in the discussions should be removed as a deterrent for examplethis kind of behavior happening again.
I would then tell them we would like to have them continue inalso recommend given the community becauseseriousness of the big impact they have had on it butmisconduct that I am going to dock them 3000 reputation points for them cheating the system and if it happens again their account willaccounts be permanently deletedremoved.