Jet Airways — request to do refund of all the ticket

Hi, i have send emails and have no response.
I request to refund all the ticket ticket and need you to send me the cancellation letter. Thanks a lot!
Here’s flight detail:
My booking detail is for 2 ppl.
Go trip :
19april 2019
From hong kong to delhi 9w 0077
12:10pm -15:45 pm
From delhi to kathmandu 9w 262
19:10-21:15

Return;
30april 2019
From kathmandu to delhi 9w 0259
18:30-20:20
From delhi to hobg kong 9w 78
01:05-08:55

Can you please kindly get back to me, i need to arrange it. At least i know you are going to refund and the confirmation letter with the cancellation document, thanks.

C