Cleartrip — i am not getting facility of credit shell

Dear sir,
Pl note that i have booked indigo flight ticket thru cleartrip through trip id:[protected] and pnr no rn577n for 27th may, 2020. This flight has been cancelled by the air lines. I have checked with the airlines who have already creditted the amount to cleartrip account on 28th.
Since 28th till the time i am trying to rebook the tickets through cleartrip site but they are claiming that the credit shell is not linked with this pnr. This totally harassment. I desperately want to book fresh ticket for 31st as my family is stuck up at kolkata due to lockdown.
Every moment the ticket price is increasing. I am suffering without my any fault and negligence attitude of cleartrip.
Pl help me out immediately.
Rgds, md. Tanweer alam