Respond to defective return notice. Also limit of 15 days is from 15 days of receipt of notice. So, quote date nearby 15 days & file reply to defective 

Time limit

A person who has received notice under section 139(9) about the defective return can rectify the return within a period of 15 days from the date of such intimation of defective return u/s 139(9). He may also rectify the defect within such extended period which the Assessing Officer may allow on receiving an application.

If the defect is not rectified within the allowed period, the return shall be treated as an invalid return and the assessee shall be treated as if he has not filed a return and be subjected to penalty or interest.

The Assessing Officer may condone the delay and treat the return as a valid return if the defect is rectified before the assessment is completed.

If it's shown in Your Dashboard then Go to try to Supbmit Your Response... In case it can be support. Bcoz, In some of the case recently ITD will be give extra times... GO TO TRY...

Generally upto 90 days, we can respond to defective return.So file it if option is available to reply.