Advised me I have benefits then turn around and say I must pay!

If I look at the 1 star rating, and the fact that don't even bother to respond to the reviews, then I guess I am only venting as nothing will be done. I've been with Bonitas for 7 years, and have change plans this year. Unsure of my optometry benefits, I've enquired from them, they responded on email that I have full benefits. I then proceeded by going for an appointment and order my lenses. Now they came back to tell me I have no optometry benefits whatsoever. I would never would have gone if I knew I don't have any benefits and it will come out of my own pocket. They are utterly ***********, and can't be bother to man up to their mistakes.