Dropping out of uni and repaying finance

Hi so I haven’t attended uni since November, I informed them by email but didn’t fill out a withdrawal form. I moved out of my accomadtion in December and handed in my keys and everything. Since I hadn’t filled in the form I haven’t official dropped out yet and have just kept forgetting about it. I still got my loan in January which was about £2200, £1500 of which I was charged for my accommodation. So now I’m goin to drop out does anyone have any idea how much sfe will ask for immediately, and if it would be less because I’ve still had to pay my accommodation, and why the payment plans are like, how little can you pay each month, if anyone has had one before. Any help would be greatly appreciated, thanks.