Air India — refusal to give a refund for a cancelled flight.

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We booked flights to india and hong kong with air india on 19th april 2019. The total cost of the ticket for two people was gbp 4267 the booking reference was zcy2y.
On the 29th october air india cancelled the hong kong delhi sector of this booking, ai317 on 8.12. This was a connecting flight that connected with flight ai161 from delhi to london heathrow on 9.12. T
They offered no refund or alternative flight and all the contact numbers they gave me were unobtainable. As they suggested, i contacted ecommerce but they did not reply. When i tried to call the numgber in india i just kept getting further down the queue going from 4 to 8 in the 20 minutes i hung on.
It was not until we flew to india and went to the air india office in jodpuhr that we were able to speak to an agent. They said that if we wanted a refund we would have to fly to hong kong. We were not going to do this as they had cancelled our return flight.
We consider that this was unreasonable behaviour by a national airline. They took our money but did not provide the conteacted service and it was impossible to contact them unless we went to an office in india. When we did go to the jodpuhr office they told us to go to hong kong for a refund. We live in the uk! We would like a complete refund of the delhi - hong kong, hong kong dehli sector. Please try to reslove this for me.