Air India Express — Refund problem

I booked a return ticket to travel from trichy to sharjah on 07-july - 2020 and[protected] through cleartrip value of aed 1280.
Month of march i got reschedule notice around 7 hours on both trip and informed i am eligible to get full refund if reschedule time more than 3 hours.
Somedays later i sent request through cleartrip to cancel tickets but i got noticed to get refund only aed 858.

Can you please help me how can i get balance also where i am not mistaken.