Independent TV — refund my amount

Address:

Hayathnagar, 501505

My self srinivas reddy, i have applied service center from (Independent tv) pantel technologies, and have paid amount of rs:20000/- on 09-feb-19, , till now they didnt send me any stock and then i requested for my amount back but they are not taking any action on this... And i have also given my f&f settelement letter also but there is no response...