I can't see how this self-confessed accident can be construed as a warranty claim. If Trek help you out you got lucky.
I didn’t crash, I didn’t actually see a twig in the chain/derailleur, I just assumed that.
A mech hanger is supposed to be a weak point on a bike and snap to prevent derailleur and frame damage.
The mech hanger has 20NM printed on it, this has subsequently been amended by Trek to 25NM, almost certainly because of this issue, this information has not been directly conveyed to customers.
The fact that they are aware of this issue but have chosen to accuse me of lying about the circumstances of it happening is quite frankly appalling.