Temporary Tablespace Not Releasing Space?

We have EBS database with version 11.1.0.7 . Our tablespace is not releasing space ,as the below query show that TEM2 is using only 3 g .  

SELECT   A.tablespace_name tablespace, D.mb_total,         SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,         D.mb_total - SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_freeFROM     v$sort_segment A,         (         SELECT   B.name, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_total         FROM     v$tablespace B, v$tempfile C         WHERE    B.ts#= C.ts#         GROUP BY B.name, C.block_size         ) DWHERE    A.tablespace_name = D.nameGROUP by A.tablespace_name,

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