Was that "someone" a repair tech, or just a sales clerk? It sounds like a reset / angle adjustment / shim change is in order, but pictures and measurements would help. With the NT system, adjustments are no big deal, and not very expensive. (We are not allowed to discuss prices here). The action must get higher as you go up, to allow for wider swings as the strings vibrate. There should around 6/64" between the top of the 12th fret and the bottom of the wound bass E string, ~4/64" for the treble "e" string, and roughly 1/2" between the strings and the top measured near the bridge.
Also consider the humidity state. If the guitar is currently very wet, the top will swell up, which raises the bridge and makes the action high. Dry guitars have the opposite problem.
There is a more sinister possibility, that the bridge had come off and was re-glued incompetently, and not quite in the right position. Don't panic - very low percentage of that being the case.