Separation package

I got 2.5 month pay separation package after 8 years of working in one company.

My lawyer write a counter offer, mainly on two legal ground:

1. Long time low pay: I am the lowest pay at my level.

2. Wrongful termination: I was only one laid off, after my medical leave while we are very busy

I have been there the longest, the most qualify - CPA

We are asking for half year settlement, my company has been ignore the request.

The 21 days is up on April 15th.

What options do I have?

Now I am willing to sigh it since I found my job so quickly, but minimum I need my other potential employer has limited access to my personnel file.

How do I negotiate?

Thank you very much!!!!!