Urgent help

Hi
I am in my second year of university in bucks new I have to go away because of family problems i have said i can come back in 2 weeks but I feel like it take more time however I know that the university I'd saying if i need longer break i need to put stop to my studies but i don't want to drop uni and I said I will do all my work on time and meet all my assignment. Can they legally kick me our or force me to drop uni. And what's that called when u go to another country for few weeks even tho your uni has said no and the consequences to it