The puffed ones I've had look like the Michelin man - they were puffed to the point they looked like they were ready to blow. The puffed cell had pushed off the unpuffed cell quite noticeably. When I got new ones, one new in the pkg was starting to puff. I had that one replaced by the seller.

Is the cell continuing to puff - if its growing any at all, I'd def ask to have it replaced. If they don't want help you out, see what advice they will offer. These may be old and have sat too long somewhere. I've had cells puff just sitting.