Reliance Bigtv — pre booking and refund amount

Address:

new colony, gali no-7,areraj,east champaran, East Champaran, Bihar, 845411

Reliance didn't install my setup box on given time (30-45 days) as promised. And now got message setup box installation will be in june 2018. I was make my order on 13th april 2018. Now, i want my refund of 499/- back. But nobody giving me right information about this.
I called continue for one year but not information right now. Then one day called on[protected] for refund on 18th march 2019. They told me they have no information about refunding and they suggest me to do mail on [protected]@rbtv.in.
I also sent a mail on [protected]@rbtv.in. But after yet days, didn't get any update.

Now, i have purchased other setup box from market. So, i need my refund only

Bank info sent on [protected]@rbtv.in and also attached