Air India — Refund is pending for more than 4 months

I have booked tickets for my parents-in-law from thiruvananthapuram to newark and then return from newark to thiruvananthapuram in air india. I booked the tickets through myticketstoindia. Due to covid-19, the flight has been cancelled and hence i have also cancelled the tickets through the booking agency "myticketstoindia". The booking agency has charged me additional $150 for performing the cancellation process and submit the refund request to airindia. I have verified that the tickets were cancelled through the airindia website. But i have not received the refund amount. While checking with air india, they are asking me to contact the booking agency. While checking with the booking agency, they have clearly mentioned that the tickets were cancelled and refund request has been submitted to airindia and currently it is pending with airindia and they have put on hold all the refunds. My booking reference is v9umyc.