Yatra Online / Yatratrip.in — GoAir cancelled the flight and refund the full fare to Yatra on cancellation, but Yatra deduct the fee in the name of convenience

GoAir flights was cancelled (due to some technical issue) for my booking( Booking Ref No.[protected] a day before travel by airlines side, Airline offered for full refund for cancellation and I opted to proceed GoAir for the cancellation of the booked tickets. I checked with GoAir support they told that full amount is released already release from their end on 24th Oct from their end and I need to check with Yatra. After several followups, Yatra paid the amount (after weeks) by deducting 810 Rs and told me it is convenience fee that is deducted.
I asked Yatra team for the policy link where it is mentioned that if Airline cancels the flight from their side and release the full refund, Yatra can deduct the amount in the name of convenience in such scenario, but no update received yet.