Air India — Airline refused to board and did not provide next flight ticket

I had an Air India Flight from London - Delhi (AI162) connecting flight Delhi - Vadodara (AI823) on 11TH DEC 2022 with Master Dhairya Pathak (British Visa holder) . Our both boarding passes (London - Delhi - Vadodara) was issued by Air India staff in London I asked then to provide me through check-in but she refused and told me that Airline will take care, layover was 1.30 HRS . but due to short layover all immigration security & boarding process i reached 5 minutes late at boarding gate and Airline refused to open it. And also they refuse to give me same day next flight and other assistance & compensation too. So I have to book my ticket from another airlines with extra baggage cost.