Stupid work

So these people at the place i'm temping at still aint said 'oh by the way todays ur last day' which i reckon is pretty out of order. So I went and spoke to HR who then tried to brush it under the carpet, like oh well no one told you sorry. Not good enough, I'm gonna be out of pocket for like 1 week so realistically they should be paying me for the week they should have given me notice for. What a piss take I still don't understand why they are goin on so fool fool