Hi,
First of all, ask your current employer to provide a receipt that was given by the RPFC when your Form 13 was submitted to them. Once you have that in your hand, you will be in a better position to know the exact date of submission of the form. Next, find out with the PF department the status about the same, whether the form has been processed or returned to the current employer for want of more information. The easiest way, though, would be to refill the form, arrange for Form 5/10 and Form 3A from the previous employer, attach them with the new Form 13, and forward them to the current employer to be sent to RPFC.
Best Regards,
Harsh