Course mistake. HELP!! :)

Today I wanted to reply to my offers when I saw that my course at Southampton is Mehanical Engineering with Foundation Year, while I wanted to choose Mechanical Engineering (Automotive). Southampton's Admissions Team won't reply till tomorow (at least) and I have 2 days left to reply to offers. I want to go to Southampton, but I don't want that additional year
It is was my mistake and I would like to know if it is possible to change that?

The Admissions Team might not reply by tomorrow if you e-mail them. However, you will have their answer today if you call them right now.

I've got an automatic reply which says: "The University will be closed on Monday 5th May for the nationwide Bank Holiday. We apologise for any delay in responding to your query but will endeavour to get back to you as soon as possible when we return to the office on Tuesday 6th may."

Is it still worth trying to call them?

It cannot do any harm, can it? Call now and if it is indeed closed, you will definitely be able to get in touch with them by phone tomorrow.