Sun Direct — No Signal sun direct

I am PP Kurian, from New Delhi. My smart card No. is[protected], My sun direct is not working from23 Jun 15. The TV shows No signal (E48-32). This fault happens frequently and the mechanic from Surya Enterprises, G-1805, New Delhi visit my house and charge Rs.150/-for every visit. The fault is still existing. We have great loss due to non operational of Sun direct. I have given complaint on 26 Jun 15, but no action taken so far. Request to repair my immediately without any cost. I am facing a lot of problem