Air India — Extreme delay in cancellation refund

I booked return tickets for my parent back in November. These were refundable tickets from BLR-SFO. My parents made the flight to SFO (with pathetic customer service while flying moreover) but unfortunately I had to cancel their tickets back, because of emergency in the family - namely, death of my grandfather. I cancelled these refundable tickets back in the first week of December hoping to get the refund, especially during these unexpected and difficult circumstances.
It is now the last week of March and still no word about the refund! My credit card travel agent has received no communication in over 3 months.
This is BEYOND any reason and is as pathetic as it can get.

WHEN CAN I EXPECT A REFND ON MY TICKETS CANCELLED 3 MONTHS BACK, AIR INDIA??