Bubbles

I started getting meat from here once they got HMS certified. I once bought chicken from here from the pre-packed plates. The cashier smelled it and I asked what was wrong. She said that some of the meat had gone off so she was checking. When I went home and unwrapped it, the meat was stinking. My issue is: why didn't they take the meat off the shelves if there was a possibility of it being off????
Anyway that was few months ago. Yesterday i bought chicken, not prepacked, I asked the butchers in the back for baby chickens. Two of them were smelling a bit when I washed them. I thought its just me and it can't be off, so I proceeded to cook it. As soon as it got hot it started stinking horribly so I knew it's definitely off.
Never getting meat from here ever again.