Hitachi Home & Life Solutions India [Hhli] — faulty product

I bought a hitachi 1.5 ton inverter ac on 24th may'20 from entertainment paradise.. First struggled a lot for the installation, after so many follow ups installation has done after a week from the purchase date.
Due to my wife health issue, i hvnt used ac for next two days from the date of installation.
After two when i was on the ac, i am surprised that the ac is not cooling. I lodge a complaint for the same to higher authorities of hitachi mr. Rajiv and rajesh nagri but there was no serious action taken by them.
After multiple follow ups, their technician came and confirmed that gas is not available.
It was seriously very surprise for me that at that time.
After fixing the gas issue, some irritating noise came from indoor unit, which is still coming.. Sometimes i feel l bought a cooler on my hard earned money instead of ac because it's noise very badly.
Then again i have logged multiple complaint for the same.
For which their service technician come and check and fix the sound by stating now it will not come sound.
After an hour or two again that comes even more than before.
Then finally said they will replace the indoor unit but i don't know how much they will take and who is the responsible for this.

Note: i have mailed multiple times but not received proper revert from them

I have been harrased a lot and in this covid 19
Situation multiple technician came for the inspection and the fix the issue.

Who is going to bear this pain...
When i will get the resolution
What is the guarantee that due to this indoor unit, outdoor will not effect on this
Attached the av