In terms of termination pay you are entitled to receive reasonable notice or pay in lieu of notice.
Generally, in determining what is reasonable notice Courts look at several factors including the length of time you worked for the employer, your age, your position, the likelihood of finding new employment etc.
At the high end, if you were in a managerial position, the Court would likely order one month's notice or pay in lieu of notice for each year of employment. If you were not in a managerial position the Court would order somewhat less.
If they are telling lies about you then you can also sue them for defamation and in this case the damages would be significant because the lies are impeding on your ability to get another job.
For these reasons you should consult with a lawyer at once and not continue to discuss anything with them until you do.
Does that help as a starting point?
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