Air India — Air india refund pending for a month.

It's been a month we are waiting for refund for flights that were rescheduled by you. and you offered to cancel free of cost. we are calling customer care daily with no response no action. we spend hours of our time trying to connect to the supervisor finally speaking to one named "Shubham" who promised to help and get back with a status, but it's been 3 days no call back.
there are 9 tickets cancelled but seems like Air India is not bothered about customers.
Case number 00846656, 00836198.