One of my hole "clips" came apart after about 3 months of use. I just snapped them back together from each side of the map and I haven't had a problem since. I suspect if I had used super glue when I snapped them back together, they never would come off again. Not sure what you mean by "stuck" on floor as the "hole clip" is really just a small donut that lays on the "peg" sticking out of the floor.
I haven't any idea as to how many extra mats VW has available as spares. If I remember correctly, the whole mat package cost about $90. I suppose if VW buys your warrantee request, they will just give you another set. That wouldn't cost them much with their wholesale price. Ask them for a new set. All the can say is Yes or No.