Nationwide Home Comfort Seniors Beware of SCAM Toronto Nationwide

I’m writing on behalf of my parents who are in their 80's. I recently noticed that some filtration system was installed in their home and upon asking my dad, he said some guy installed for the government and that it would be no charge. I thought it was strange but let it go for a month, today I was over dealing with some of his bills and to my shock I saw a charge for $67.79 on their Gas bill. from Nationwide Home Comfort. When I showed my dad he got upset and said, the guy said I don’t have to pay when they installed it and almost broke out into tears. I then find out it’s a 10 year contract? WOW. My parents are in their 80’s and I have started the process to get them into a seniors home, my mother does not speak English and my dad understands about 20% on a good day. He’s hearing is not good neither is his ability to comprehend what is being said. He indicated that the guys just kept coming back to his door (3 times) and kept saying it’s a government program or something to that fact and he understood no charge to homeowner). My parents do not a filtration system nor did my father understand what was being installed, nor the contract, Also they can’t afford this monthly charge. I question the tactics of the door to door individuals that visited my parents. Anyone in their right mind can easily see that these people are not understanding what is being explained to them. I'm waiting to hear back from Nation Wide. I tried calling the contact and I can't even leave a voicemail, so that's not a good sign already.