Air India — Change of dates for tickets PNR: KLJHLF

Address:

302 Upnishad-2. B/h Akota Stadium. Nr IOC Nagar

PNR: KLJHLF

I am trying to re arrange departure date from 10/04/2024 to 11/03/2024 but web site Manage your booking says this change can not be done on website and that I need to contact customer care/services. There is no email address and phone nbr only gives recorded information with sms for link and the link says amendment can not be done on line.
I am in Vadodara where city office has been closed. At the airport they ask to phone and that phone gives link per sms to manage booking, This is a vicious circle and BAD FOR CUSTOMERS OF AIR INDIA.
Air India this way is doing BAD customer service as if they dont care for customers. I am British passport holder but on holidays in Vadodara Gujarat India and experiencing this problem and hence complaint.