Feeling ripped off on the cost of a front break job ?

I'm going to try to have a calm conversation with these folks and have them explain how my brake pad replacement evolved into a $1600'brake job. If they don't adjust the bill I'll dispute the charge and we can work it out in court. I do have honest mechanics working on my other vehicles.typical story , they don't want to work on my RV. . I'll be picking it up today. Hopefully at least they'll have got it right on the repair so I don't have to have another shop get involved. Thanks for everyone's input.