Goodyear tyre

I bought a new Hyno Truck which currently has 26 000 km on the clock. The side wall of the one back tire burst. The tire was inspected by Chris from Goodyear Customer Service. This was the report he gave me. (Sidewall damage impact. No manufacturing defect. Not covered). I phoned him to ask for a full report but he told me that was not possible as they can not know for certain what happened. I informed him that I will go to Toyota for assistance in this matter to which he rep**** that I can do that and subsequently put the phone down in my ear..<br> <br> Will it be unreasonable to request a detailed report from them or is it fine to accept their comment without a satisfactory motivation as there is at least 70 % tread left?