[Client BUG] Lost access to New Client, thus access to league itself

I was given the newer client and so out of curiosity, I logged in with a banned account and had "Keep me logged in" turned on, and now whenever I reload up league it automatically logs into the banned account, looping me with the same ban message and closing the client. I've already tried restarting my pc and it still occurs so I just reinstalled league and lost the client