Further Investigation under Sec.173/8

I have filed a FIR case under sections 406, 409, 420, 465 & 477A with fool proof evidence on the orders of CMM Court under sec. 156/3. Police filed a biased charge sheet making 5 out of 6 accused persons witnesses against themselves in the Crime. The investigation was incomplete and it was shoddy as the matters of the Complaint were not touched at all suppressing the evidences collected and available with them. No arrests were done. 2 who were reported arrest was granted anticipatory bail with the help of Police themselves. (I suspect Police is influenced) I have filed a protest Petition and the Magistrate forwarded the Petition with an order to Police to file their reply. I find Sec.173/8 is in force where it is mandatory for the Police to further investigate the case and file further charge sheet where they are given those evidences. Please confirm that there is no need of any Court order for Police to conduct further investigation as Sec173/8 is an order in itself by the Statute.