Termination from Multi-Billion dollar company and offer to join a new formed smaller company

jaya-janki
We are a group of people working for a multi-billion company in one of its profitable business units. The company decided to let go ff the business unit as it does not align with its business roadmap. The business unit head/management said ok and took over the control.
Now the business unit management has terminated few employees and paid then severance package. For the remaining employees, they are merging the business unit to a small services company whose existence is not known to IT domain. The group of employees are demanding for a severance package similar to the terminated employees as we are asked to voluntarily resign and take the new offer. However the business unit mgmt is pushing the concerns to the company HR area and telling that we are giving you a job, that itself is a great opportunity.
Many of us do not want to join the small company and are demanding for exgratia in case we are forced to take the offer.
I would like to know how this situation can be handled leagally.
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