Cleartrip — Did not receive full refund against flight cancellation by airlines.

Address:

ClearTrip

Both of the below flights were cancelled by airlines. And i was confirmed by them that i will get full refund for the same, however cleartrip did not provided me the full refund. [i booked ticket from amazon.in site. Didnot knew they have their internal tie up with cleartrip. When i tried to cancel off tickets, i was then routed to cleartrip site]

Pune → kolkata fri, jul 03, 2020 indigo 6e 623 pnq 02:55 | pune - lohegaon (Pnq) to ccu kolkata - netaji subhas
And
Kolkata → pune tue, jul 07, 2020 air asia i5 598 ccu 20:30 | kolkata - netaji subhas chandra bose airport (Ccu) to pune - lohegaon (Pnq)

Their site shows below payment details:-

Base fare ₹ 3544
Gst (Airline) ₹ 206
Taxes and fees ₹ 2475
Total ₹ 6225

₹ 6225 paid via deposit account
Refund ₹ 4228.0 (Why ₹ 6225 - ₹ 4228.0 = ₹ 1997 less?)
₹ 3253 paid via to deposit account
₹ 975 paid via to deposit account

Whereas i have only received :
₹ 2620.50 transaction id : at201830004000010059080 amex credit card order id :[protected]
₹ 622.50 : cashback in amazonpay account (While booking the tickets) order id : p[protected].
—
Total : ₹ 3243

I still need to receive ₹ 2982 more.

I have dropped them email, sent them chaser mails. Raised ticket on their site #11416456, still they did not get back to me with any concrete information.