Capital Honda India — Repeated windshield crack due to wiper blade rusting

In the last 6 months of lockdown for the second time the windshield in my Brio has cracked. The crack starts exactly at that point where the wiper falls. Both times the crack has been at the exact same spot. The first time, Honda service Center professionals convinced me that it is due to some stone that would have fallen on the windshield. While I was absolutely not convinced how a stone could fall on a covered car park and during lockdown when I didn’t take my vehicle out, I still went with it as I was not sure what else could have caused the crack. So, after insurance paid for 50% or so, I paid the rest out of my pocket and replaced the windshield. Now again within 6 months the sam exercise has reappeared. I checked the wiper blade and could find that it is rusted and during service no one bothered to check the wiper blade or replace it. My vehicle is with Capital Honda OMR and the service Center folks are adamant that it’s not because of the wiper blade but because a stone or some hard object has fallen on the car.
Is it even sensible to tell me that in a covered car parking where two other cars are kept, a stone or a hard object falls on this particular car’s windshield and at that particular spot for the second time in the last six months?

Why can the Service Center accept its mistake that they missed noticing the rust or fault in the wiper and replace the windshield that’s broken due to their fault?

Why do they want to fleece honest customers who service car regularly with them time and again? The car number is 7503 Honda Brio.
Is there someone who can intervene and put some sense into this matter?

I am ready to take legal action if need be, as this is not just in the interest of money but in the interest of getting justice.