GTPL Cable — set top box

Address:

Ahmedabad, Ahmedabad, Gujarat, 382449

I m mehul joshi, leaving in new mani nagar ahmedabad, we have gtpl cable network and local operator name is pc world vision. Before 15 days, changed set top box, by technician but after changing he has kept old set top box. Which after every 15 to 20 min automatically shows no signal and starts after exact 1 min.
Complaint lodged in gtpl and local cable operator. But he his not coming inspite, calling him so many times.
Kindly resolve the issue, bcz this operators are not giving proper service and charging lot of money. They r not afraid of any body.