Be banned????

I am a lol player who played this game for 4 years,I play lol everyday. when I log in today , i find my acct been banned, no email, no phone, no reason . plz give me a reason and explain to me. i used this acct for 4 years and bought all the champs and skins, at least 3000 bucks on the game and i am very disappoint to you. contact to me ASAP.
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