Thank you All for your kind suggestions (and jokes
).
To summarize the whole story short, I did went to Abu Bakar. Took my driver with me. Left the driver and car with abu bakar after finalizing the price and everything.
Its just that the car a/c unit needed cleaning/servicing. Nothing else wrong with ac. total charges 2800, including service labour and gas recharging. Time taken was just above an hour and a half.
I would say, Abu Bakar is really a good person and honest too. Car A/C is now awesome, no matter how much is the heat outside.
Thanks to all of you, specifically @Xulfiqar, @aqibasit, @alee1, @cooldevil and all the rest.(too many names to mention).