Waynio theres only one thing that can help you now
From the pictures you can see the bash has been used but I dont think that ,just because the frame has snapped there, it means he has landed on the bolts.
I personally feel that the half price warranty is reasonable in this case.
Although after 5 weeks of riding a frame, i'd be rather peeved if it snapped.
IMO the rubber bits underneath should be blocks rather than those cylinders but thats up to onza.
Thanks,
Callum