Took our vehicle for factory recall work ... they ...

Took our vehicle for factory recall work ... they recommended approx $400 additional work that needed to be done to car. We took to another mechanic for a second opinion and mechanic said it didn't need the additional things Younger recommended. We took for the second opinion because on two previous visits questionable things happened which didn't set right with us -- charges and more questionable work that needed to be done with additional charges. I assume mechanics make % for bringing in work ??? Don't know this for sure but do know we feel they are very questionable.