Company is making excuses to create documentation of poor performance and lack of interest in work, while as per what has been stated all documents regarding medical conditions has been given from time to time.
Probably you can raise the level to higher ups in writing.Obtain an acknowledgement of your letter.
Company cannot legally stop your maternity benefits payments but subsequently they can create problems about keeping you on rolls.
How where earlier lady employees treated when time for maternity benefits came up?
That could be a kind of guide about company attitude.
Legal remedies do exist but one has to be careful and take all steps to solve matters in house before approaching Labour officer and advocates.
PS Pl make your query in paragraphs for easier reading and understanding.
You should be able to get your answers from the act itself. Refer to the below link.
Most of the scenarios are covered in this. You can act accordingly.