uni application

hey, this is a pretty niche situation and i'm not sure if anyone can help, but i had to leave my final year of a levels in early march { i've already done my final exams as its at a college } due to personal reasons but i was still determined to go to university. I contacted my first choice student support, explained the situation and that i was predicted an AAB before i left and was given a B in my first year. After some back and fourth, they came to the conclusion that they will offer me a foundation course and i could join them the following September. They updated my firmed choice on UCAS to this course but, it still says that it a conditional offer. Meaning that id still be required to get a triple C grade which i obviously don't have as i left. So, im just not sure what i have to do on enrolment day. Should i chase the university and ask ? call clearing on the day ? call the uni on the day?
if anyone has been in this situation or has any advice it would be much appreciated