Ot and shift changes

This is purely your decision either to work with dissent or search  alternate  job suitable to your requirements from a philathropic enterprise..  Either you have to work or some one has to work in your place, and such type of adjustments / compromises are needed in private jobs.

 From the language of your post it is guessed that it is some IT/ITeS/BPO/KPO/Call center company.

Such company in Pune shall be covered by Bombay Shops and Establishments Act.

Make a gentle request to the Manager and resolve.

Download the instruction to work extra for 1 hour, and attendance record.

If OT is applicable it should have been paid.

If there is NO record the demand for OT may be brushed aside by claiming that stayed on your own and completed pending work.

Another Perspective: Try to build rapport with Boss and cross floors.

Or such matters should preferably be taken up thru IT-ITeS/ employees’/trade unions, Works Committee, Grievance Redressal Committee (Grievance Redressal Committee as notified and framed in Karnataka for IT/ITeS companies) .