Mex Rent A Car review: car rental misrepresentation

I received my confirmation of my car rental reservation and learned that Mex Car Rental was the company that would be handling my upcoming rental. I was shocked to learn that I was not receiving unlimited mileage that was described when I originally rented the car. I have been renting cars for many, many years. I tried to find a number where I could reach them, but was unable to do so. I then stumbled on Yelp's review only to find many one star reviews claiming being dupped just like me. I was further insulted when I canceled the reservation and was charged $40. Cancellation was supposed to be FREE and I was charged around 20% for the privilege of being lied to. I am fumming.