Make my trip - Refund for Cancellation Travel Restricted to JP

We booked a ticket for Travel to Tokyo from New Delhi via MakeMyTrip in October ****; our booking Id is NN*************. However, on November **, ****, we received an email from ANA with the following message:

" URGENT NOTICE FROM ANA TO ALL THOSE ENTERING JAPAN – RECEIVED VIA EMAIL FROM ANA SKY WEB anaint-proactive@***.ana.co.jp on November **, ****
As a strengthening of border measures for the Omicron variant, foreign nationals will be suspended from entering Japan for the time being from November **, ****, for the time being. (Including those who have an existing visa.)
If you depart from a country outside Japan before midnight on November ** and arrive in Japan after that, this restriction will not apply.

All Japanese and other returnees are required to wait for ** days regardless of whether or not they have been vaccinated. In addition, for entry from specific countries, a waiting measure will be taken at a place separately determined by the quarantine station director.
Please check the Ministry of Health, Labor, and Welfare website for details. (Japanese page)
International flights to and from Japan, during November **th - December **st, can be changed or canceled without charge. Please refer to the ANA website for details."

Based on the restricted entry for Non-Japanese Nationals, I requested cancellation or a future issuance of travel credits on December **th, ****. Since the past three months, I have sent multiple emails and called customer service at Cleartrip, requesting either a full refund or a date change for future travel on the same route; however, there has been no refund or credit for future travel received to date.
I called ANA at their US Number +*.***.***.****, and I was informed that the ticket is “unused.” Since the travel period was within the time frame when the foreign nationals were restricted from entering Japan due to Omicron, the ticket is eligible for a refund or date change for the future. However, since this ticket was purchased via a travel agency, the Airline cannot directly process this request, and it has to be channeled via the travel agency.
It has been almost three months since we have tried to resolve this issue to no avail.