GoIndiGo Airlines — Refund of credit shell amount

Respected Sir,
I, shailendra shankar marathe, residing at thane, Maharashtra, booked tickets for self, wife Shilpa, son omkar for journey between Mumbai and Guwahati between 04 april 2020 to 18 may 2020. The flights were cancelled due to lock down on account of covid-19. The airline goindigo intimated that the amount of tickets is in credit shell and can be utilized in one-year span. As per honorable supreme court judgement the amount of credit shell is to be refunded. I communicated for the same and goindigo is still replying that the amount is still in credit shell. Further it was communicated that the journey under pnr EP1I7E is completed. It is therefore requested to resolve the issue and goindigo be directed for refund of credit shell amount with appropriate intrest.
Thanking you,
Yours sincerely, s s marathe, mob no [protected].