Ontario Home Services sold my father (and me; I signed for him with his consent) a contract for water-cleaning services

Customer: Ontario Home Services sold my father (and me; I signed for him with his consent) a contract for water-cleaning services in Feb. 2017. My brother called them to cancel that same evening and though reluctant they said they would. My brother warned me to look for it on the bill, just in case, but I was not always the one who paid my father's bills for him. Because my father died a month later, I forgot all about it, and have been paying the bill since then, as it was included in my Enbridge bill - it's several pages in so I never noticed it until a couple of days ago when Enbridge made some kind of change that required me to look further in. The financial company, Utilebill, that handles the OHS contract, says that they won't accept a cancellation even now without a registered letter but will continue to charge us. Nor will they compensate us for what I think was a contract obtained under duress - and false pretenses too, as I thought they were from the government at the time. The name "Ontario Home Services" made it sound that way.
JA: Have you talked to an Ontario lawyer about this?
Customer: No, I have written to Better Business Bureau to complain, though. I only discovered the problem earlier this week. BBB has answered, and so have two different people from Utilebill. I see that both Utile and Ontario Home Services have had many complaints made against them by consumers.
JA: What steps have you taken so far?
Customer: I wrote an email to BBB, and I am in the process of writing one to Utilebill but have not sent it. I have received an email in response from someone at Utilebill yesterday (very rude) and someone else named MaryEllen Mendoza today, somewhat more polite and informative. The first one did not say who their client was - just said they were not the ones who were responsible. Anyway, I thought I'd look for advice before sending anything more.
JA: Anything else you want the Lawyer to know before I connect you?
Customer: I can't think of anything offhand but he or she might think of details to ask that I've forgotten about. Thanks.