What is your sepm version?
Edit
For 12.1 try to reset it
https://www-secure.symantec.com/connect/articles/how-reset-symantec-endpoint-protection-manager-console-password-sep-121
https://www-secure.symantec.com/connect/downloads/how-reset-sepm-password-121x
To Receive resetpass.bat file, you could log a case with Symantec Technical Support.
How to create a new case in MySupport
http://www.symantec.com/docs/TECH58873
OR
Phone numbers to contact Tech Support:-
Regional Support Telephone Numbers:
- United States: https://support.broadcom.com (407-357-7600 from outside the United States)
- Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
- United Kingdom: +44 (0) 870 606 6000