[Resolved]  Voltas — AC Gas filling charges during warranty

I live in Asansol, West Bengal. I have a 1.5 ton 3 star inbuilt inverter split AC which I bought on 9th July '21. I called for service and water leaking problem in the 11th month of purchase. The technicians while resolving the water leaking problem informed me that gas filling is needed.
They have done the same and charged me 1500rs saying that my pipe is longer than 10feet of copper wire/pipe provided by Voltas. But I got to know that gas filling is free if done during warranty period.
Please resolve this issue. Your on ground team MS enterprises in Asansol were not helpful at all in resolving this. I asked then for official written charges again and again but to no avail. I have sent mail on voltascare 2 days back but got no reply. Didn't expect this poor customer service from a brand like Voltas. Switching costs are negligible if you treat your long term customers like this.