HappyEasyGo.com — flight cancellation refund not provided what it should have been

Address:

Bangalore, Karnataka, 560076

A booking with trip id :[protected] was cancelled on
01/mar/2019, which was booked for 03/mar/2019, sagata misra from
Guwahati - bangalore, i got the ticket cancelled from indigo customer
Service and they confirmed the same was initiated on the same date
Itself and after doing all deduction i should receive an amount of
1326 inr approx. And so i also cancelled the booking from happyeasygo
Website for the booking.
But the issue is that the website only refunded only inr 340/- on enquiring they told that they have deducted inr 500/- as website fee but such thing wasn't mentioned anywhere plus if they deducted inr 500/- where is the rest of the refund?
They are not responding now