Breathe Pure Air Inc

I feel really foolish, I have been over charged by a supplier who came to my house.
On 3/31/18 I had a Breathe Pure Air Inc (as per their invoice) duct cleaning come in to clean my house ducts but they ended up cleaning my wallet.
As the story goes they had an advertisement for duct cleaning (Cambridge Pure Air, Air Duct Cleaning) in the Money Save Magazine which my wife called and employed them. They came to the door and my wife explained that I had a disability and would not be able to come down the stairs. She proceeded to show the ducts and the furnace. They then prepared to start and I questioned why they were not cleaning the furnace. They said it wasn’t in the price and after I argued briefly I agreed to carry on getting the ducts cleaned. The leader (Jason) of the 2 men said they would check the furnace and make any recommendations.
Shortly after going down stairs he come back up to me to state that the previous guys we had do the duct cleaning damaged the fins on the ac coil. I said I was going to go down to see when he quickly said he put the cover back on so I couldn’t see it. He started bragging how he was a certified gas fitter to work on furnaces and he told me how outdated my equipment was but it would last another 5 years. I asked him what it would cost to repair the coil and he said he would have to call the office for a quote. He went away and came back in a couple of minutes to tell me it would be $419 on top of the $139 for ducts. I told him I would get a new coil for that and he said it wouldn’t be allowed because the law changed and they can’t use these coils any more. He said I would have to replace my whole ac unit. He scared me to the point that I agreed to have him fix my coil. He said he would have to take it out of the furnace and straighten the fins and that was why so much money.
He came back to me in 15 min and said all done. Not thinking anything about that, I paid him and they left. After thinking about it for a while I started wondering how he fixed the coil in a half hour.
When my wife came home she helped me go down stairs to check their work. They did not do anything to the coil. I JUST DISHED OUT $419 FOR NOTHING. How crooked can people be.
I am losing trust in people and the service industry any more.
I Placed a call to them and complained they said someone would get me back. That never happened..
On Tuesday 4/3/18 I called again and finally got a person called Wayne who said he was a manager. I explained my story as above and he said he would call me back after he talked to Jason.
He called me back again and said he had Jason on the line, but when I said hi Jason no response. He ask me how I knew he didn’t take the coil out. I told him the covers were not removed because the silicone was not disturbed and none of the lines were disturbed. He said there is enough flex pipe inside to pull the coil out to clean it. This is absolutely wrong as the use of flex pipe is illegal on air conditioning.
I said to him I wanted my $419 back and he then said he was going to compromise but because I said that no way he was going to deal with me now. I said what kind of compromise and he again said he didn’t want to deal with me. I then said ok goodbye. He called me back to give a phone number for legal proceedings.
I was going to take them to small claims but I will have to much difficulty doing this because of my disability, so I have to abandon that idea. ALL I CAN DO IS TO WARN PEOPLE ABOUT THIS COMPANY I DEFINITELY WOULD NOT RECOMMEND THEM !!!!!