Lloyd — AC not working after 4 months of purchase

Well this year in April-2022 we purchased a LLOYD window AC from a dealer. After 4 months of working its front coil has caught rusted and due to which its CFC gas also leaked from its cylinder. After that I registered a complaint with customer care and two service engineers came and tell us about the rust in front coil. So they told us it need to replace which takes 4-5 working days.
I would like ask LLOYD is this the quality of your product you are charging us ₹28000 per unit well its so bad impression to my family as well as to other customers around the globe. We were expecting this AC to work life of 4years but it got bad within 4 months. Look forward and resolve our problems.