25 August 2013
Service tax return can't be revised after 90 days of filing the original return.
I believe now you have to intimate the service tax authority regarding the same. Ascertain what mistake has been committed. If less tax has been paid, pay the tax with interest and then intimate in writing to the Range Superintendent. Write a letter clearly stating the correction you want to make and get your copy pof the letter acknowledged. It would ensure that you made full disclosure of the facts.