Mr. Lube Canada review: Tried to charge for service I did not agree to

Went for a oil change yesterday and they tried to charge me $491.00 for service I did not agree to. When I disputed that charge they then tried to bill me $40.00 for topping up some other oil in my car, which of course I did not pay either. BUT to make matters worse this morning as I was on St. Clair Ave, pulling away from a red light my car hit a bump in the road and my hood flew open. Luckily I was not going fast but what if I had been on a major highway doing 100 km. Being a woman and a senior I feel like they think I'm stupid, NOT I really have concerns now about using Mr. Lube again.