I think, this bearing job could had been easily done for Rs 700, which may include 200 Rs of bearing and rest maximum 500 Rs of labor.
Did he pulled the vacuum on the system, since compressor was down so I would had been wise if you could have drained the old oil and replaced it with new R134a oil.
Most of them recharge the gas by a rough guess. Easiest method is to measure the Ambient Temperature, then read the Ambient Temperature pressure chart and charge from low side according to the scale on suction and discharge line as mentioned on the chart.
Gas charging is easiest of the job with biggest profit margin. Any person with little knowledge on subject can do it himself.
I think your problem is that he did not pulled the vacuum and did not charge according to the table.