Advice on Handling HR Issues
A sincere piece of advice from my side: kindly mention the name of the company (for the benefit of all our HR colleagues) and the name of the HR personnel as well so that we all know who's the one spoiling the image of HR. After all, one of the purposes of this site is to discuss, seek help, and find ways to develop and improve HR.
Coming back to your issue, kindly check if somebody else who joined your company after you has been assigned a PF number. If so, then, my dear, your company has been deceiving you. Lodge a complaint immediately through a lawyer. Note your establishment code, bring your employment letter, monthly salary slips (with bank statements for the relevant period when your company paid your salary), and all other official documents issued to you by your company when you file the complaint. If leave records have not been properly maintained, it's the company's problem, and you need not worry as long as you have proof of the salary paid by the company.
As rightly suggested by one of the experts, send your complaint letter through Reg. A.D., with self-attested photocopies of all the documents you received from your company, including different F&F letters, and ask for explanations for the discrepancies. Politely request them to process your PF immediately and inform them of your intention to approach legal authorities if any further delays occur.
If you do not receive a reply within 15 days, send a second letter in the same manner. This will serve as proof that you have given sufficient time to your employer and resorted to legal action only after exhausting all other available resources.
I believe this guidance will assist you.
Good Luck,
Cheers