This has to be a scam. There is no way to get removed except from the company who put you there. This person may try and get all your account and credit information under the guise of "helping you out", only to take your money and run. Besides, why give someone $600 for something that, if you have a legit reason, can be done for free?
Guy doesn't even know proper English, and I'm going to trust him with my $600 to remove an account from chex systems? I don't think so. If he doesn't know that you are supposed to capitalize an I, or put a period in between sentances, I think I'll let this offer pass me by.