Hey there @Crystal_Wolf67 and @Xiflato and welcome to the Ubisoft Discussions !
I'm sorry to hear that you received a temporary ban in Rainbow Six: Siege. This could be due to the degradation of the game's servers that day. That being said, these penalities are issued server side by an automated system and cannot be overturned. You will therefore need to wait until the ban is over. For more information, I recommend checking this ...