Robertson's Mix Brian Swims Risk Management Dept Windshield damage Corona California

On the morning of December 4 a little after 8 am. I was merging to the 210 fwy from the 10 fwy. noticed traffic and 3 to 5 cars in front of me and in front of them a Robertson's mix truck. I was hearing a lot of noise kind of like popcorn. moved to the left shoulder, almost passing the san bernardino exit on the 210 fwy when i noticed where all the noise was coming from, at the moment i fell sorry for all the cars behind the Robertson's mix truck, because i noticed all the pebbles flight left to right from the back wheels of Robertson's mix. thinking back never seen so many, I don't recall seen the mud flaps, I only remember seen the tires full of yellow dirt and dust or pebbles flying. unfortunately as i was passing the left side of the truck, i heard a crack on my right side of the window, glanced but didn't see anything, I thought lucky me, but in the next exit i noticed my windshield crack at least 6 inch, since then it has progressed and its  all the way to the driver side. I called the next day to Robertson's mix and left message. and have left many messages since then. at one point i believe during the month of December, my phone calls weren't even getting picked up, I thought they either memorized my number or they are in vacation. of course that was a long vacation. I have moved since then the house where i use to live does not exist. but i never received then a letter to start  my claim.  I called my insurance then this accident happened, unfortunately i was not covered then, since then i now am covered, unfortunately it doesn't covered this accident.  I called Nissan where I always take my car for mechanical issues, and asked for a quote for the windshield, and their price with installation is $375. and its not even the original, original is a bit more than $600. Their Response " after carefully reviewing my claim, they denie liability, it doesnt meet any of their requirements for liability" Really??!! oh " that it should be covered by my ins as an unavoidable road hazard" oh and " Thats our firm and final possition on the matter" ppffft what a bunch !@#$%^