I'm sorry, how much space do you need?

Computer Science student here, and it looks like my group partners have no idea what keeping classes short and straight to the point means.

The project is in C++, and I'm trying to understand this mess that they made, when they have a class called "Manager" that basically did EVERYTHING, whose header file has only the declarations of functions. 50+ functions. Only half of then documented, and most of them with apparently random names. The file has more than 200 lines of reading.

I've never worked with so much Spaghetti in my life yet.

Worst part: I spent time and effort organising some other classes, breaking down methods, untangling code and all that tedious stuff. But one week before delivery, they decide to delete all of my work, because they "didn't understand it" and didn't even think of asking me to explain the changes.
And if that wasn't enough, they refused to give me some percentage of the grade due to that code not being in the delivery.

I am so freaking done with those guys -_-