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I believe that King know about the recurring problem of nonsense scores in the weekly contest but they seem not be able to do anything about this. King don't actually read your posts here as this is a forum for players, to try to help each other and give advice. Nonsense scores do get reported here quite often and my best advice would be to ignore this and hopefully the same player won't keep showing up in your game next week. However if you want to report this then contact Player Support. You can do this here and choose the bottom option to report abuse/cheating.
UPDATE: This same person Youmi23 has appeared in my Weekly Contest THREE weeks in a row now. They do something like normal wins in the first day (say, 150), then when I overtake that, they instantly go up to 5000 or so. The problem is NOT that they are my "friend" and it's not that I "have no friends". This is supposed to be random allocation where "friends" aren't a thing, it's not, this same non-person-bot is in my Weekly Contest EVERY week, I can never ever win.