Go First Airline — Non refund of full fare against Airlines imposed flight cancellation

Website:

www.flygofirst.com

Refer PNR LBRDYQ and DEU37R Go first flight number G8-791 for flight from BLR to CCU scheduled 2000 hrs on 12 Feb 2022 being cancelled due to airlines imposed cancellation and intimated vide their SMS and email to my registered mobile number and email ID.
It is submitted that the airlines charged a total fare of Rs 6215 against PNR LBRDYQ and Rs 18914 against PNR DEU37R but are not refunding the amount in full but a meagre amount of Rs 800 per passenger. Also they have not arranged any alternate flight without any charges but rather are charging regular fare as per daily fares of those flight.
We are in deep trouble as have to book another flight at huge cost on different airlines plus our reaching time to destination has been impacted.
I request authorities to take cognisance of the matter and help us get our hard earned money back.
I attach herewith screenshot from manage booking page of PNR DEU37R from Go first website where I am required to pay further Rs 38944 for rescheduling (This is when l have already paid previously Rs 18914).
This leads to a total payment of Rs 57888 for the same PNR that too for the airlines imposed cancellation and no fault of me.
The plain cheating done by Go first airlines is nothing less than a criminal offence and needs to be dealt with accordingly.
Also the helpline number provided by the airlines through their mail and SMS yields no result as the call terminates automatically and nobody picks up to respond.