mmr boost baned for playing the game

i was playing on my account when one day i try to log in and it says you have been suspended for mmr boosting how can i be mmr boosting by playing on my own accound in ranked solo duo with my friend we can play together no problem but after few games i get suspended. i have not been active in the game the last 2 seasons but i managed to get to diamond few seasons ago and i got to plat this season and it says i have been baned becouse i played on my brothers computer taht is in another part of the land i live in and that is acording to riot games mmr boosting
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