You can try to bring the tablespace out of quiesce state by using the following commands -
"quiesce tablespaces for table <tablename> reset"
However I have a feeling that this might not work as there are potentially missing files.
As the output help for the SQL statemement indicats you can restore the tablespace.
Alternatively, if the table is empty and/or or was being loaded with replace option and the table's content can be discarded/ignored, you can load from an empty file in the table(s) using "db2 load from /dev/null of del replace into <tablename> nonrecoverable".
You need to provide the tablespace and table names, db2 logs (db2diag.log, load output/message file), the state of the tablespace (db2 list tablespaces show detail).
(You can email by clickin above my user-id in the forum and sending a private message).
-- Jayesh