You can transfer the PF money from Co. A to B [thro Form 13].
The employer B will now send the transfer request to the employer A for the Authorised signature / clearance which will be forwarded to the PF office.

You can do the same activity when you move from B to C. Now the employer C will initiate the request to the employer B who inturn will liase with the PF office.

You can know the status of your claim thro this weblink
Employee Provident Fund Organisation (EPFO), Chennai

also you can get in touch with the consultant who handles the complaince..
Revert for clarifications if any