You are saying that you are 100% sure but this can’t be done without knowing your password . I m telling you again that this is done by a person who knew your password . Just recall all the steps of funds withdraw and just imagine the security features involve in it:
1- He signed in to your fiver account . Without signing into your fiverr account he is not able to do it .
2- Then he click fiver revenue card option from your earnings .
3- Now he needs to sign into your attached email . Obviously it also needs id and password to sign in so he also knew this one and he did the steps and transfer it immediately to your payoneer account .
4- Now he signed into your payoneer account and obviously it also need your id and password to sign in . He knew this one too and signed in and transfer money somewhere else.
Now there are four step which involves three accounts sign in with different ID and Password . Without knowing all these ids and password NO one is able to do this . This is awesome clear !!
Someone may send a keystroke logging into your system , you may clicked any link or software through email or through internet which had installed a undetected keystroke logging software in your system and he had store your all the key logs and used it . If you are sure about the first one then he may used this tool .
Now you can only wait and track where the money has been transferred from your payoneer account if it would have been done from logging then it may be transferred to the other country in this case you can’t do anything except totally formatting each and everything from your PC and clean install new window and change your password of every account . Remember to change password after reinstalling of new window otherwise log will also record your new password too.
Till then you can use on-screen keyboard to avoid key logging.
If it is transferred to your country then you can get your money back and trace that person from the transferred account.
Best of luck !!