The TPMS should not need "resetting." If the tire is repaired or replaced and the original rim and sensor combo is put back on the vehicle, it should automatically clear the TPMS warning after some miles.
Unless something like fix-a-flat was used and it destroyed the sensor and required a new sensor and a reset/programming.
After you replace the flat tire with the compact spare tire, the low tire pressure indicator stays on. This is normal; the system is not monitoring the spare tire pressure. Manually check the spare tire pressure to be sure it is correct. After several miles (kilometers) driving with the compact spare tire, the TPMS indicator comes on and the low tire pressure indicator goes off.
The low tire pressure indicator or the TPMS indicator will go off, after several miles (kilometers) driving, when you replace the spare tire with the specified regular tire equipped with the tire pressure monitor sensor.
The above taken from the owner’s manual: Page 315.
I would ask the dealership what they did beyond the owners manual, which states, to do pretty much nothing. Did they charge you for this?