Air India Express — My refund is pending from a long time

Hello, i’ve been waiting for my refund from air india express since long. I’ve dropped couple of mails to aix, but they keep on telling that it’ll be credit to the source account in a couple of days. But refund isn’t happening. I cancelled my ticket on 14th july 2020 and was informed by customer care over call that credit will happen in two weeks of time. I even received the cancellation details over mail. Aix seems to be not reachable over mail and call. Their call centre is never reachable.