I have to assume you snapped the end off of them?
I do recall this issue, and there is a ghetto fix. I remember tying a knot in one end, and stretching the fan clip, it seemed to work for a while. As for why they wont reply to you, I have no idea, but I am off to look and see if I can find other rubber straps somewhere to replace them with.
Maybe run these through the fans, then tie the ends together?