Since both users are banned for scamming already there's not much we can do, I doubt they'd be willing to return the account since they stole it back. However should they ever wish to return to OSBot they'll need to refund this account as well. Sorry for your loss.
Charging back is considered scamming whether a user is banned or not. We will investigate to see if this user is indeed ban evading, but you will remain in TWC for the foreseeable future @Imagine.
Now we have to ask why there was a charge back at all. @Imagine you seem to think that he is a ban evading user, did you charge back in hopes he couldn't dispute since he was banned?
He's probably trying to get at the fact that Jagex changed some widget IDs, I believe mainly on root widget 162. This is probably affecting the entering amount on GE, I can test and make a proper report in a little while if you need me too