I've been banned from LoL, but... I've stopped this game 2 years ago.

Hello, I just received this mail telling i've been banned. I didn't play for the last 2 years. I don't mind about the ban itself, i have no intention to play it again, but i'm concerned about the fact that someone was playing on my account. Is there a way to retrieve my account's data? (I mean: connections time, Ip addresses, etc.) I would like to investigate this thing. If i've been hacked, there might be a lot more in the balance than this account...
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