Most probably, they have stopped converting it to LTF after a year after it's launch - as it became the most popular CB card out there.
Even many SBI staff and SBI Pensioners were not able to get it converted to LTF in the recent past.
So, avoid trying some silly tricks - like threatening to close it - they may close it without any delay.
Do not go by someone's old post. Read the situation as of now. And, play safe.