with my limited knowledge.

Yes indeed you can file a dispute with paypal.. But in this case it will do you no help at all as,

1. The guys deposit into a bank account claiming to be FTZone but not transferring the funds to a paypal account

2. Paypal will require an email address to check as that will be their paypal account else they are unable to track where the funds etc go to

3. The money that went into the bank account were not transfered to paypal at all in the first place hence not in paypal's jurisdiction

4. Even if you have the bank account and go to Paypal, i don't think they will disclose the information of who's paypal account is linked to the bank account number you provide, as it have an issue with the privacy rights of the account owner.

sorry that i can't help with OP but just shed some light on babylis's query