Air India — Flight route change and Inflight tv problem

Address:

UK

Firstly, I travelled with my father and sister from London to India. My daughter also joined us later. He is old, nearly 90 age. We booked direct flight to Kochi but Air India cancelled the return flight (more than once) and we had to fly via Mumbai, on a much longer journey. We booked Air India only for direct connection to Kochi. My seat was no longer available and I had to book new seats further back on plane. My booking reference is below. I am now seeking compensation - a part refund of return flight cost due to a difficult journey on busy flights. My father and sister and daughter are under separate bookings (PXFXXU and U21ZT7).
Secondly, I had problems with inflight tv system on outbound and return flights. My tv was not working and I could not watch anything on 9 hour flight. This was unacceptable. I was not offered any solution from Air India and suffered very long journey with nothing to do when other passengers were watching entertainment movies. I am seeking compensation from Air India for the inconvenience on both my long haul journeys. I am back in UK now. I tried to contact Air India but no response to compensation.
My name: Mary Verghese-Dipple
Air India flying club member number:[protected]
E ticket number:[protected]copy attached)
Booking ref: MG3YCN
Date: 7 December and 21 December - return flights.
Thank you