It is the fault of my ductwork

When our wife & I first bought our home, the two of us made sure to have the heating & cooling proposal checked by a local Heating, Ventilation & A/C contractor. She told us everything was in enjoyable condition & proposed annual repair services. The people I was with and I enrolled in a program that included a fall service for the oil furnace & upkeep for the air conditioning in the Spring. The people I was with and I assumed that this would keep the entirety of the Heating, Ventilation & A/C proposal running properly. The people I was with and I never gave the duct proposal a thought. My wife & I counted on the Heating, Ventilation & A/C contractor to handle all of the necessary inspections & cleaning. Unfortunately, the serviceman totally ignored the HVAC duct. Over the years a whole bunch of contaminants built up inside, preventing the heated & cooled room from reaching its intended endpoint. This caused rooms that were either warm or chilly, no matter how the two of us adjusted the thermostat. Plus, the oil furnace & air conditioning were required to run longer, work harder & use more energy. Our energy bills gradually climbed higher & higher. When the two of us noticed that our air quality had also diminished due to a steady influx of dust, the two of us finally had the HVAC duct professionally cleaned. The people I was with and I chose a unusual Heating, Ventilation & A/C supplier, one that specialized in duct services. The serviceman found dead mice in our HVAC duct, along with dust, bugs, webs, & mold growth. Every time the oil furnace or air conditioning operated, it was sending harmful spores, bacteria & particulate into the air our wife & I breathe. Our health was put at risk, & I blame the Heating, Ventilation & A/C provider who was paid to handle our annual repair.