Sony India — In Sony TV - persistent WIFI disconnect issue

It’s has been a painful experience since buying, KD-43X80J, Sony’s TV. Barely weeks after the purchase the TV started to have Wi-Fi issues i.e. the Wi-Fi disconnects after power recycle. The Wi-Fi module was replaced but still the issue persisted.
It's been months since I am trying to get their attention to resolved the issue.
I have opened a new case again on CROMA, since the TV was bought from them, the technician came and promised a senior person will visit you. It has been 4-5 days since then.

Please, help me to get this resolved and hoping my complaint serve as reminder for other consumer to what to expect from brands like Sony.