Its is mandatory for the SHO to Iodge an FIR if a complaint made by you discloses the commission of a cognizable offence.You have the right to obtain a copy of the FIR.
In case your complaint discloses the commission of a non-cognizable offence, an entry is required to be made in the daily diary and you have the right to obtain a copy. You may thereafter approach the area magistrate u/s 155 Cr. P.C. for appropriate orders.