Air India — abusing senior citizens

Disgusting Air India, we had two tickets booked for senior citizens, aged 70+
When they reached there and were standing in the lines and were supposed to be issued a boarding pass and had a confirmed ticket too. They were told that the flight is over booked and no seats are left. It took 3 hours to sort the problem. And finally they have a ticket after a 12 hour delay. Is this how people are to be treated. They were sent counter to counter. Is it a DTC bus that the seats were over booked. Worst flight. No care or respect for passengers. Disgusting employees. Take action as soon as possible.