It could be humidity (moisture) or air trapped beneath during the painting process.
Low paint quality... Its alto or cultus if i am not wrong?
Yes, its 2022 Model Alto, what should i do to avoid more damage?
Sorry but I think nothing you can do if moisture trapped beneath the paint. If you take it to a painter, he will peel off the paint that is damaged and repaint it.. Repaint is not a big deal but i worry about the rust buildup
Please someone guides how i can avoid further damage to the paint?
Get the moisture out of the affected area. That means going to the bare metal and getting back up to primer, base coat and clear.