Air India — cancellation refund delay

I had to cancel a to and from flight from toronto to delhi with in 24 hrs of booking on dec 14th, i was assured by the customer care that i will get 100% refund (Due to 24hrs cancellation policy) in 7 days. However, i haven’t received my refund yet. I have contacted the customer care many times and have sent numerous emails to e-commerce team. So far, i haven’t received any acknowledgement what so ever from air india.

I had made the payments using canadian credit card and the amount was cad 3509 $.

Booking # yv9c8
Name : gopal mittal