Siti Cable — Disturbed channel

Address:

West Bengal

I have bought my set top box from raju cable of alimuddin street kolkata-700016 on november 2012 which is a siti digital set top box but there has not been a day since that day when i get a clear picture the channels are always disurbed to such a extent that we cannot view the channels...plz hlp..the operator are saying they repaired but the problem is persistent
HELPPPPPPP