Without prior notice forced resignation

I was working in MNC IT Firm from past 5 years.I took transfer to a place where no much project opportunities.So after my project was successfully over I got released and was in business wait for 60 days.But 1 month went like that because I was assured through many meetings that my allocation will be extended and have mail communication too.But It did not work because we are blocked for resignation and to unblock there is a lengthy approval process. I got selected for one project but it could not work because to unblock me they have to take approval from CPO.An that project has not started. On 64 days HR called me to resign or else they will send me termination letter.On 65th day they sent me termination letter ,later they mailed me resignation acceptance letter with 2 months BASIC pay only. In termination letter whatever reason they have provided that is not correct. They should pay me 2 months full salary.They were not ready to allow me to serve notice period also. What should I do?Please suggest. I don't have any document other than Resignation acceptance letter.I have to wait 1-2 months for experience and relieving certificate. I need your guidance.