In that case, it is better to give a letter to the PF department stating that the account is closed and requesting a letter to change the payment details to the new bank account. For that, you should enclose the following documents:
Enclosures:
1. If you have any confirmation of account closure, then enclose that copy; otherwise, get a letter from the bank stating that your account has been closed and any payments from the PF department will be returned.
2. Cancelled cheque leaf of the new account for confirmation of name, account number, and bank details.
Even if they are not accepting it, don't leave the matter. Take the same to a higher level. Tell the PRO that you need to meet the Case worker, then the Accounts officer, and finally the Commissioner. Your problem shall be solved.
I have also faced many issues with PF and got them solved.