I was terminated once (well the T STRONGLY suggested I seek help elsewhere) and this T was a specialist in DBT, which was why I was seeing her! A DBT specialist can't take the BPD crazy at its finest! Anyway, I don't regret challenging her, and I'd do it again!
In this case, Skysblue, you have a more much developed relationship with your T, and she knows you as a whole. I really don't think she'd think you're challenging her for the sake fo being difficult if you discuss the (outrageous) payment. I also think its a worthwhile to revisit the phone call issue if you need to as well.
I think what's more important is your attitude, demeanor, and choice of words as well as your self-reflection, honesty, and openness. She will see your sincerity and be open to working on these with you. My current T always thanks me when I tell her something that has bothered me.
My DBT T terminated me because I sparred with her CONSTANTLY, disrespectfully and rudely.

But hey that's my best defense mechanism.