[Resolved]  Voltas — Split AC Outdoor unit coil and gas leakage problem.

Address: Pune

I bought voltas 1.2 ton split AC in April 2016.
It was all working fine.
Suddenly in April 2021 when I called the team for maintenance they said there is problem in the coil of the outdoor unit and this is causing gas leakage and the AC wont cool enough. I want to know how can there be a problem in the outdoor unit coil when there is no human interference or physical handling..
Now if I want to repair its costing me around Rs.11, 000/- thats almost 1/3rd cost of the AC..
In April 2021 I have already spent Rs.3000/- for gas refill to check if there is leakage problem it lasted for 2-3 months. After that the AC was not working.
I can understand if there was any physical damage done by mishandling the product.
But its an outdoor unit and it is supposed to be designed as per Indian standards if the damage is due to some external factor such as the weather.
The maintenance team suggested that its the common problem with aluminum coil and now I should go for copper coil that too warranty not beyond 6 months..
So if this problem occurs every year do I have to pay Rs.11, 000/- every year to keep my AC working.?
The bigger problem is that I have 2 ACs of the same model.
What if the 2nd AC too create same problem due to Aluminum coil?
I am no expert in this, I am talking about the aluminum and copper coil as suggested by the voltas team itself.
Thank You.