There was a fire in the apartment next door that caused damage to my apartment. The insurance company of the apartment next door is refusing to admit liability as they say there is no proof of negligence. I obtained the Official Fire Report and it confirms that the fire originated from a heater in the apartment, "but it does not confirm the cause of the heater catching fire." I have been told that I need to prove there was negligence from the unit owner or prove there was a defect in the heater that caused the fire. Otherwise, if the cause of the fire cannot be determined, I will be unable to pursue recovery. It has been nearly a year since the fire and I don't know how I can prove negligence. Is there anything I can do? I feel like I am being treated unfairly.