Here is whole IPC section in a glance; http://mynation.net/laws/bare-acts/ipc/ipc.htm
as you only know which laws to apply and what they have done to you.
find other laws here http://mynation.net/laws/ which will help you
dont forget to check CrPc http://mynation.net/laws/bare-acts/crpc/crpc.htm
and remember keep all SMS and other threats in original device/SIM only
there are judgments about, how to use Audio/Video Evidence here http://mynation.net/docs/sitemap/
and let us know and we will help you to draft letter/complaint to Police.