I highly doubt you will have any luck with warranty on tyres as it is a "consumable" like brake pads ect, NO manufacturer covers those types of items.
If it were me i would just buy some decent tyres.
I still have my stockers on my second set of rims but they only ever see the Black top, i just wouldnt trust them off road at all, even after seeing Tyson from this forum giving them hell at Yalwal and the ZigZag area of Lithgow.