Permabanned with no warning is that a thing?

I have been playing League for a bout a year-ish and most of that time I was playing in like 2 week chunks. I have never gotten chat banned (though my friend has on his account). Never have been temp banned or anything like that (though I play with friends who have) and I come to log in today after not playing for a week and I am perma-banned :( It's a bummer considering the money I foolishly spent on the game.... I never got an E-mail as the log in says I should have received but I have submitted a ticket to try and figure out whats going on. You all have seen posts like this from various people over the past few months as I have been reading them, but I assure you that I am absolutely confused and wanted some input to see if its actually possible to not get a warning then be banned :/ Everyone who has ever played the game has gotten angry for some reason or another so don't hit me with those cliches... I am looking for someone who is educated on the topic to give me a hint on how to find out exactly what I got banned for, not just a page that tells me everything I could be banned for. To be banned with no warning that I was breaking the Summoners Code, is a little ridiculous... Does anyone else think so?