HappyEasyGo — convenience fees deducted

Address:

122001

Dear sir

I made 3 booking from happyeasygo.com and booking was cancelled by airline due to flight time change and i asked happyeasygo to refund the full amount because airline provided full refund but they deducted convenience fee 280 rs. Per person.
When i asked them to return this amount also, they rejected my request.

Flight was cancelled by airline then where is my mistake.
Why i should have to pay 840 rs. Unnecessary to happyeasygo.

I want my money back.

Regards

Kimmi