Hi Sayyed,
If you employ five contractors, and of those, two contractors have fewer than 20 workers, then you cannot insist that those two deduct PF. From his view, he is right. He cannot apply for the PF code in anticipation.
Similarly, at the time of engaging a contractor, please mention all statutory requirements to be followed. Any liability not complied with by the contractor falls on the Principal employer. Many times, the Contract Labour Act is not strictly followed anywhere, and the principal employer is also not serious about this. The remedy is that you have to deduct and remit on behalf of them.
Additionally, there is a headache. His staff who turned up this month may or may not turn up next month. You cannot collectively remit as a group for PF. Individual member registration and paperwork are required. Anyway, approach a consultant for more clarity; it doesn't matter if it costs the company.
Regards,
Chandru