Air India — 100 % refund of my return ticket cancelled by air india

This is with reference to the return ticket refund which has been cancelled by air india on 28th dec 2019. I have been communicating with air india on the toll free number and it has been several times in last two months discussing the same matter of refund and also provided my mobile number. And still nothing has been done. The delay is meaningless and is subject to compensation with explanation. I have been told continously that the refund will be processed in 20 working days and there is no need to worry about it. But now i am worried about my refund and due to lack of credibility on behalf of air india.
The tickets dated 15th jan 2020 (Sfo to delhi) & 16th jan 2020 (Del to bdq) has been cancelled with full refund promised. So, please process the refund of ticket number[protected]. Locator/ control no : yjssr in my bank account. And frankly speaking air india doesnt seem to have the intention to refund the money with 50 % penalty due to the changes made by air india by cancelling the ticket. Because my return ticket will cost more being a single ticket and plus have to book it in sort time. And in todays crisis it is going to be very very expensive and uncertain to book a return ticket from any airlines (Bad experience with air india).

Thanks, do the needful asap.
Minesh. S. Waghela