People trying to sell elo boosting (A report)

So I just logged on today and there was a friend request from _Name Removed_. i just accepted without thought and suddenly i got a message from it saying that i can get 10% off on free elo boosting on this elo boosting site... Unfortunately I dont have a screenshot as I instantly unfriended and blocked the person... But isn't this a bannable offence? it's selling something highly unethical and against the rules... Sorry for the weirdly subtle and ambiguous post, but I don't know how else to report this type of account.
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