Severance pay usually depends upon the amount of money that has been fixed by your employer at the time of joining but this simply means that you need to get your terms cleared out correctly. The amount of Severance pay that you can claim usually depends upon the amount of money that you were making so if you feel that your Severance pay is low at the time of claiming it, you can always refer to the Severance pay law to learn more about how much is a fair severance pay and how much you can actually claim.
In order for you to actually claim your severance pay you need to make sure that the organisation that you were working for offers severance pay in the first place or not. While this is something that most organisations offer and it is a rule for organisations to provide severance pay to the employees that they layoff, there are still a number of companies that do not provide Severance pay and in case you want to claim severance pay even though the organisation has refused to do so you may have to take it the legal way.
If you are laid off then you have a right to severance pay and you can drag the organisation to court. However if you are claiming for a severance pay in time of an emergency when you are still part of the organisation this is something that does not fall under the legal law and you cannot claim for it. That being said, organisations that offer severance pay even chooses to provide the severance pay to employees that are part of the organisation in times of need. The amount of money released totally depends on your relationship with your employer and how they are ready to co-operate.