Hello Biswajit,
If your establishment delays in remitting the employees PF dues to the PFO, then the PFO will issue a notice (after the reconciliation which they generally do at the end of the year) specifying the same with the interest & penalty amount for the delay.
The penalty interest is hefty and takes care of the interest which it (PFO) has to pay to the members.
You should file a grievance online and also send an application with the grievance to your respective PF Office. These days, the PF Officials are quite vigilant and prompt. I am sure they will take necessary action.
Good Luck.
Regards, A.B.