Transffer fee

Dear sir, I have my own house in flat at Ahmedabad-Gujarat. We have purchased house at 16.9.2014. At that time administration is under builder & buildier has not ask transffer fee officially to us n we also not paid to him. we have legal documents of our home that we are owner of the same. Now builder has given administaration to commeettee (on 1.5.2019) formed by our society & paid 25% of maintenance fee amount of total amount to our committee. Now our society committee ask transffer fee of 20 000/- to us . Though society is formed on 1.5.2019 n we are living before that so how society is ask transffer fee to us. Also who has paid illigal transffer fee to building before 1.5.2019 builder has not shown transffer fee amount in total amount paid to committee. Now question is that shall we pay transffer fee of Rs. 20000/- & is it legal? if we dont pay fee then can society take any legal action. Also we dont know society is registered under housing co operative society act. pl. advice what to do. Saurabh shah Ahmedabad M-[deleted]