Sony India — Sony TV kdl-49w800g not connecting to Wifi and Sound device

Issue with TV started 2 month back that sound was not getting switched off in between of watching TV. After complain, sony representative changed HDMI cable to optical cable. Now If I use external speaker then sound will come from both TV and Speaker.

Another issue with TV is that its not connecting to wifi internet. We need to manually change the TV time and then connect wifi internet. I have purchased TV for Parents as they does not know much about technology they are not able to use TV.
I have given multiple complain but there is no response form Sony. They are just staying that they will look into matter but from last 1 month I have not received any reply form them.