possibility to enrol in summer courses after missing payment deadline?

Hey everyone! This is my first post so please go easy on me lol.

I registered for summer school (eco and his courses, specifically) and was enrolled, went to class, etc. However, i forgot to pay and now, when I log into acorn, I have been (as expected) removed from both courses. Under "2016 Summer" it says ""financially cancelled" - You have not deferred your fees or made the minimum payment required for this academic session before your division's registration deadline. You have been removed from any courses you were enrolled in and you will not be able to enrol in other courses for this session."

My question is: Is there any way for me to enrol again? Obviously I will pay in the next 2 days but will they still accept me and allow me to register? Who would I need to talk to in order to make this happen? Would there be an extra cost?

Any help would be greatly appreciated!! Thank you so much :)