Dear Anil,
If a loan has become NPA, 13(2) Notices will be issued to you, irrespective of your financial position. In your case you have pointed out that,
1) You have made objections to the 13(2) Notice within 60 days and there was no response to that.
2) Your total outstanding amount is less that 20% of the principal amount you have borroweed.
3) The bank has taken symbolic possession after affixing the notice on your premises without giving you notice.
The answer for the above questions are as follows.
1) Any objection made to the notice under section 13(2) of the SARFAESI Act has to be replied within 7 days of the receipt of the objection.
2) If the outstanding amount is less that 20% of the principal amount you have borrowed, the banks cannot proceed to recover the money under SARFAESI Act.
3) The bank can take symbolic possession of the property after the lapse of 60 days of 13(2) Notice, and you need not be served any notice prior to taking possession.
Anyhow you have a good case on the 1st and 2nd grounds. You can very well approach the DRT and get a stay to further proceedings under section 17 of the SARFAESI Act.