Dear Jani,
The same is not correct as per PF rules; once a member will always be a member, even if his salary increases from 6500 to 15,000/-. His contribution is payable on 6500/-. But once the member withdraws the PF amount and settles his/her account with the PF department, then he/she will cease to be a member of the PF Fund. The example given by you may cause a problem for the employer; the contribution is liable to be paid in respect of such a member and cannot be discontinued.
You can do one thing: ask the member for resignation and withdraw his/her PF amount. Then, upon a fresh appointment with a salary more than Rs. 6500/-, have the member fill out Form 11, stating, "I am not a member of PF amount." However, it amounts to unfair labor practice as you deprive him of benefits pertaining to continuity of service. I hope this satisfies your query.
Regards,
Janki Jani