Maternity Policy in private sector

Such establishment might be covered by Shops & Estbs Act of the state and hence covered by the Maternity Benefit Act until or unless covered by ESI, exempted.

Refer:

Maternity Benefit Act, 1961: Sec:2

Maternity Benefit (Amendmnet) Act, 2017 

First of all: Submit, under proper acknowledgment, intimation of pregnancy alongwith doctor’s Rx showing tentative date of pregnancy delivery and Maternity Benefit application, and request to supply requisite forms if any, to be submitted by employee, by Redg. Post.

You are likely to get  a reply.

There are many threads on similar query that you can search in “SEARCH” option e.g;

https://www.lawyersclubindia.com/forum/180-days-maternity-leave-for-women-working-in-private-sector-102343.asp

https://www.lawyersclubindia.com/forum/Resignation-after-maternity-leave-79271.asp#.UahsGdKAqWN 

 https://www.lawyersclubindia.com/forum/Maternity-act-74586.asp#.UXPE3qKAqWM  

https://www.lawyersclubindia.com/forum/Forced-to-resign-when-enquired-about-maternity-leaves-75754.asp#.UXPC0qKAqWM

https://www.lawyersclubindia.com/forum/Maternity-leave-salary-76258.asp#.UXPDG6KAqWM

https://www.lawyersclubindia.com/forum/Meternity-leave-75127.asp#.UXPEpaKAqWM  

https://www.lawyersclubindia.com/forum/Voluntary-abadonment-from-employment-82097.asp#.Ua8iV9KAqWO

https://www.lawyersclubindia.com/forum/Voluntary-abadonment-from-employment-82097.asp#.U0pY90eBmXX    

https://www.lawyersclubindia.com/forum/Regarding-maternity-leave-100692.asp#.U1N830eBmXU 

Since your wife was working for more than 2 years and there are 300+ employees, your wife is entitled to maternity benefit act. You have to apply for the benefit under prescribed form with proper acknowledgment. The company may deny anything verbally, but it will be not possible to deny maternity benefit in writing. 

Maternity Benefit act does not differ from company to company. First send the form under registered post and if they still deny then you may lodge a complaint before the labour office. 

If you are communicating by email prefer to send email with scanned copies from personal email id.