Dvat nil returns

Daer All, 

I have a new company with recent DVAT registration. I have late filed my first NIL return, but have been marked with a heavy penalty of rs 45k. can anyone suggest how i should appeal and to whom ?

Also I am not sure of what forms have to be submitted for NIl returns - can some one guide me ?

Do i also have to separately submit DVAT return and Cst return or are both covered under one Form online. ? if so then the forms for CST return may also be mentioned

Thank you for your help in advanace

ADM