^ So they just didn't own up to it. Wheel bearings are permanently built into the hub, not a separate thing to replace. That's about a $110 part for decent aftermarket or close to $160 for Motorcraft, AFAICT (didn't look long). Probably < an hour real labor but two hours book labor.
The wheel did not come off from the hub or bearings in it, failing. That would have to come from severe bearing damage which would cause half the hub to come off, so that half along with the studs through it and lug nuts on the other side of the wheel fastening it on, would still be attached to the wheel.
On the other hand, having a wheel wobbling around and banging against it towards the end, might've damaged the hub, as well as the wheel, OR it might have just bent a stud or two and they're unwilling to just put a couple $3 studs in it instead of charging more. I'd want to carefully examine the hub for damage including play and whether it spins smoothly.
It might be worthwhile to see if you can get a free consultation with a lawyer, but if they don't admit any wrongdoing then you are probably out of luck and now best served by trying to minimize the repair cost. Just don't do that by using a generic hub instead of major brand.