25 February 2015
As per Rule 7B of the Service Tax Rules 1994, an assessee may file a service tax revised return only once within a period of 90 days from the date of submission of Return under Rule 7.
So you can not revise the Service Tax Return now since 90 days have expired.
Only thing you can do is intimate the Service Tax Department of your jurisdiction in writing and keep a acknowledged copy of the letter for your record.