Patta is issued only for assessed lands and it is the settled law
1) "poramboke lands" means the lands which is not assessed to revenue records and it is outside the revenue accounts.
2) in such cases if any eviction proceedings are taken by Tahsildar you wont be entitled to any compensation
3)you can file appeal against order of eviction before district collector . the collector will after granting a personal hearing pass an order whetehr these lands are poramboke lands or not
4) you have to in hearing before tehsildar take the plea that you have been in possession of land for over 50 years . you can also seek an injunction restraining govt from taking possession of your land and for declaration of title
5) contact a local lawyer