Den Networks — not giving set top box refund

Address:

New Delhi, Delhi, 121002

Dear team,

I bought den network cable tv stb box vc no. - *
I have faced lot of trouble with the connection and have raised the concerns earlier also.
And because of lot of issues faced, finally i decided to not continue with den network cable connection.
I have already given the request in written and also told the nodal officer of the den networks to refund the amount and give the receipt while
Taking up the setup box back.
But i am not getting any response now from den networks and they are violating trai regulations.

Please help me getting the refund money on return of the setup box.