Jamatia was also elected as a member of the Tripura Legislative Assembly from Ampinagar as a Tripura Upajati Juba Samiti candidate in 1998. Later, the TUJS, The IPFT and TNV merged to form the INPT Indigenous Nationalist Party of Twipra. He served as the vice president of the party too. He was elected as a member of the Tripura Legislative Assembly from Ampinagar as an Indigenous Nationalist Party of Twipra candidate in 2003.
