ITS ALRIGHT!
Just dont go to procced with offer anymore because obviously you cant accept ur offer anymore caz the due date was ages ago, at this point everyone will get that heart stopping messege, no exceptions ( they should really take into consideration how they word things or we are gonna have lots of first year students with heart attacks lol)
Just go to My Student Profile on the left hand side of the page and once u click on it all ur current information will pop up and by now all ur classes and time details will be in the my enrolment section, on the bottom of you Current Liabilitys and if thats all there then everythings perfectly fine!
A seriously annoying miscommunication.... at least we can all breath again hahah.... but i must say i was not amused.