Voltas — faulty products by voltas (tata)

I purchased two voltas window air conditioners one in 2018 and one in 2017 both the ac started leaking gas after just months of buying, i asked why this is happening with new products they say because of delhi pollutants but while buying they say nothing about this problem, during 1st year repairs were free of cost but after that it gets really expensive sometimes coil get damaged, sometimes gas has leaked and that too in new air conditioners, never expected this from a brand like voltas which has a parent brand like tata which is know for quality products worldwide. I bought a local ac in year 2000 and it was still working flawless only issue was high power consumption, that ac never needed any repair just service once a year, really really disappointed with voltas