banned for absolutely no reason whatsoever

high mental - Summoner Stats - League of Legends
high mental / Lv. 13
Just finished a game only to find out that I've been suspended for a whole 14 days. Have a bad history of perma's, and I know when I've flamed. This one took me by surprise considering my game's were with two of my friends who typed the exact same things towards the opposing team. We didn't exactly take personal shots, nor throw out random insults, just standard banter between two teams who were taking shots at us for "smurfing". Also, I went straight from Level 2 honor, to a 14 day suspension, which has never happened to me in the past. Feel it's completely undeserved and requires a full explanation. Thank you.
Report as:
Offensive Spam Harassment Incorrect Board