Watch the video. You didn't get screwed. The cost of the bottle is $15. The machine to administer is $250 and they have to pay a tech to apply. The fragrance is an after thought. It's a disinfectant.
High humidity can condense then freeze on the evaporator coils more readily than dry air. This blocks the air flow . To avoid this keep fan on high with all vents open. Possibly, from the accident, there is some distortion to a vent that restricts air flow, to or from the coils.