I had a dealer try to sell me the same stuff in Gatineau a while back. However they were at least asking if I wanted it, not just doing the work. (Even claiming bulls*** that it would provide a warranty on the engine if I added it, without any documentation of course).
Bottom line is if they do work that you don’t request, they have to reimburse it. It is harder after the fact, but it still is your right. If you paid by credit card you can tell them you will ask the credit card to reverse the charge, and will repay them when they provide an accurate invoice of the service requested.
These treatment by the dealers make me laugh, if I really wanted a fuel additive, I would go buy it at Canadian tire and pour it myself.
Bottom line is if they do work that you don’t request, they have to reimburse it. It is harder after the fact, but it still is your right. If you paid by credit card you can tell them you will ask the credit card to reverse the charge, and will repay them when they provide an accurate invoice of the service requested.
These treatment by the dealers make me laugh, if I really wanted a fuel additive, I would go buy it at Canadian tire and pour it myself.