Expat employee involuntarily terminated overseas

I am employed by a US multinational (at will)in Bangkok. Due to global downsizing, tens of thousands of emp are being involuntarily terminated.
I have verbally been told that I will be off roll 15/12/01. Nothing in writing. The company is targeting expatriates due to cost reasons.

I have an initial contract which I negotiated 40% of my annual base in the event of invol termination. Although it is not specified in the contract, it was understood to be a three year contract. Subsequent to the completion of the three year contract, I signed an extension of my assignment for a specified period from 22/02/01 through 22/02/03.
Do I have a case to ask for benefits to compensate me for the period of time remaining on my authorized assignment extension?
This invol termination affects my retirement plan benefits, causes extreme inconvenience since we are living overseas with a school age child and we haven't lived in the USA for 30 years. I am hired on an expat package as a USA employee paid in the USA while working overseas.