Hi Jen, I think you’ll still be charged for the semester unless the University have said otherwise. I imagine there’s some virtual lectures etc? And aren’t the exams part of all that?
As for your halls I find it very unlikely you’ll be charged for that. What have your Uni said about this? Even if you are charged I guarantee you won’t be the only one effected, there will be lots of people asking for a refund and it would be unreasonable for you not to get it.
It may also be worth asking the other students on your course too.