Popular Hyundai Trivandrum is the worst place to service Hyundai, so is their Maruti. Find better AC mechanics in town and get it worked there than giving to these morons, might work out for a fraction.
Just a quick update, I took my ac to be fixed today. Yes I know it is almost a year later, but we had a lot of lockdowns and containment areas and I didn't want to risk being without my car. Another thing is this workshop is in an area which got flooded in both the previous two Kerala floods so I didn't want to risk flood damage.
As I suspected they would not let me watch the repair.
The final bill was Rs7800
Cooling coil Rs 3200
Condenser filter Rs 600
Gas filling Rs 1500
Labour Charge Rs 2500
I asked for a discount, they reduced the bill by Rs200, better than nothing, but nothing special. No official bill just a note on a piece of white paper.
Since I last posted I have only driven 750km.
Anyway thanks for all the advice, much appreciated.
PS I couldn't find my old bill which someone had requested.