Sony India — Xperia l unsolved problem for a year

Address:

Chennai, Tamil Nadu

I have bought SONY XPERIA L on[protected], Since then am facing issues with the mobile as mentioned below

1.Switch off button doesn't respond
2.If I opened walk man application phone goes mad and the screen flickers
3.Proximity sensor going faulty doesn't respond
4.Getting over heated during call
5.Getting hanged frequently

Even after providing service for three times the problem not resolved
Every time i get a reply that its a SW fault and it will be solved in next update
Two updates had came till now.. but no solution

Why you are releasing a mobile model with this much problem ???
This makes me irritated feel about sony