Highway Road Hazzards

Recently I was hit by a wheel that came off of a car that was approx 1/2 truck length in front of me traveling about 45 to 50 in a 60 mph construction zone in the right hand lane. I was in the passing lane doing about 57 to 60 mph. The whole wheel comes off and bends my bumper messes up the oil pan and rips air lines off. Making me pull off and out of service. Dot, does not write up either side and is at no fault to either drive. They said this was in the category of a highway road hazard and no report will be filled.
Then I get a demanding notice, I will have to fill out a accident report for my company or turn in my notice, so that they can turn it in on there insurance. I'm thinking why accident report when the dot wouldn't even fill out a accident or incident report. I am wondering with the new rules and points on daq files. If the company can affect my record with this matter. There was a extensive amount of damage done to my truck with nothing but a wheel coming off a old vehicle for the other driver.