Sony India — picture quality very poor showing big vertical lines

Address:

Ramanagara, Karnataka, 562159

Sub - tv picture quality going very very poor. Kindly guide me.
Dear sir,
I am bharat chaudhari, fr, achalu, ramanagaram 45th km banglore, i purchased tv sony led kdl32w600 sr. No 5384252. From above dealer sathya agencies sattur, on[protected], invoice no stu1-13/[protected]. So my 1 year warranty not valid now.
Sir, this tv quality picture going very poor vertical big line is showing since last 1 month. I have aitel hd connection so that no doubt about cable connection, now days lot of big brand we have in tv but i am selected in the world popular 1 sony why with in 4 yrs tv get problem, as compare to tv i am paid more amount for only name sony.
Kindly request to you please guid me what will i do?

Fr= bharat chaudhari atpt ahalu, dt. Ramanagaram.
45th km fr banglore,
Mobile - [protected].