Terrible quality Plastic sleeves

I recently bought a pack of 50 Croxley A4 plastic sleeves at PNA. I am a teacher so I often buy it. I usually buy Croxley as it's normally the best quality but my last purchase was a disappointment. The sleeves were all crumpled. I've tried to put heavy books on top to get rid some of the folds but then, when I put paper in, the sleeves were too small. It actually folds my paper when I put it in. Such quality is not up to standard at all. <br> <br> Regards