Tear in brand new TT fiberglass, thoughts ?

Looking at how high up these are on the wall, if I had to hazard a guess I suspect that the screws that are used to secure the roof joists were driven they "missed" and went into the wall (i.e. most manufacturers use a lag screw that they run down through the roof joists into the wall. If the operator on the line noticed the issue he or she may have backed the screws out and re-seated them, but the damage would still be present. I had this issue on a trailer I purchased once, one screw missed the rafter and cracked the wall. The dealer had to lift the roofing membrane in that area to remove the screw, and then their fiberglass repair technician repaired the crack. Done right at a good dealer the repair will never be noticeable. I agree with others who have posted, you should go to a different dealer or escalate to the manufacturers representative. I would not take no for an answer, they are obligated to stand by their warranty.