Thank you for the perspective so far.

My feeling has been to do the job to show I can handle it. Up til now, they thought I couldn't, so I guess doing it has worked because they're going to talk to me about management.

BUT, for the past few months I have felt taken advantage of, and I am well aware it is of my own making. The manager knows of my feelings of being taken advantage, and he told the bosses what I've been doing and how much I deserve the position.