Wait until there are other customers in the shop, then complain to the manager about over-torquing the lug nuts. Have them at least loosen them, the air gun will do that easily, then torque them down yourself.

If the right rotor is new, then no need to replace both. If not, both rotors need to be replaced. BUT,
Before you get new rotors, put all of the lug nuts on at 81lbs and take the car for a ride. Brake hard a few times and then let the rotors cool off while driving. See if that makes a difference.

Then, never go back to that shop...

New pads are only needed when worn, no need to replace them.
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My name is Klaus and I am a V♂lv♂holic