Demand your form 16 to be supplied to you by a gentle communication under acknowledgment addressed to the good offices of your appointing authority, MD, Head-HR, with a copy to your reporting authority/BM etc..
Some companies provide a soft copy also which can be accessing the employee portal from company's office and in case of employee who has separated the form 16 is sent to the concerned branch office where employee was located.
In case of any issue if you have to lodge a complaint you may do so by writing to CIT-TDS of the jurisdiction authority ( where your company files return) and Jt. Commissioner/IT commissioner of your location. Company can be fined to the tune of Rs.1000/day.
If Pf was applicable to your position/designation company has defaulted and you can lodge a complaint with concerned O/o RPFC. However first confirm with HR of your company for the reasons and later lodge your representation with the good offices and if no reply is given you may lodge a complaint with RPFC.