Unsurprisingly the Vice Chancellor or private sector landlord has noticed that they get to keep more of your money for themselves if they spend less of it on heating you up
You might be able to make an effective complaint and get the heating turned on for longer if you have some data... i.e. get a thermometer and make a temperature diary.
while you're waiting for that to work, some of the bargain shops* are still open and sell thermal vests & hats
* B&M, Pounstretchers, Home Bargain etc