The year code 2100 is the Account Security Compromised ban code, if I am not mistaken. At least that is what it says on the Forum Archive. If that is the case, it means that they suspected that someone else obtained access to your account, so they locked it for your protection. It does send the same pop-up and email in that situation as a normal permaban, so it wouldn't look any different.
All you need to do is submit the ticket to Player Support, which you have already done, and wait for them to reply. It may take them a few hours, as it is a Sunday, but they will get back to you soon and will begin the process of verifying that you are the account's owner. They will ask you a bunch of questions about the account, things that only the owner should know. You can find a list of things here which will give you an idea of various things that Support might ask you. Things like the first champ you bought, which ISP you use, what city/state you play in, etc.
Try to be patient, and don't bump your ticket or open a new one, as that will drop yours down to the bottom of the line. Someone will be with you soon, and will get everything straightened out for you. Best of luck, and hopefully they get everything resolved quickly and get you back on the rift soon!