To the best of my knowledge, the proposed bill has not yet been made into an Act. The maternity leave is applicable to all government servants and all beneficiaries of ESI scheme. The benefits are not meant for a particular sector alone. If your company does not have appropriate rules regarding maternity leave, you may consider the following actions:
A. Request the company to have maternity benefits, including leave, at par with government rules [Maternity Benefit Act, 1961]. Both this Act and the ESI Act are available on internet as well as in hard copy from book shops.
B. If the company refuses the request, a complaint can be made to women's commission or the human rights commission. A write can also be filed in the High Court. For all these 3, it would be better to engage the services of an advocate.