infield fly

[CecilOne]

First, the rule is could be caught by an infielder with ordinary effort; no geography, field lines, dirt/grass, base lines, caught or not, who catches it, etc. are involved. So your description clearly sounds like an infield(er) fly.

Second, either ump can ask the other ump for help on anything, but how could they change it? Once called, like fair or foul, the runners are controlled by the call so we can't undo it.
I hope it was the defense coach that complained, but I'm guessing it was offense; because they don't understand the rule protects the runners. What was the coach's argument?

Third, if there really was a rule issue, like not having two forcible runners or having two outs, that's a different can of worms.