I can only remember the ending because it was totally disturbing!
There was a girl who as revenge for something (I've totally forgotten what), puts a man in some sort of box, with feeding tubes, air holes etc and basically leaves him there.
It was so awful, I'm claustrophobic, so literally my worst nightmare and I remember being haunted by it for weeks!
I thought the programme was 'Requiem' but I've found that on Netflix and it's not.
Anyone?!