I worked for a mortgage credit company for a while

Really, your only option is to call GE Bank – explain what happened and request that they remove the late payment flag from their records. If you’ve already paid that bill plus the next bill, that’d probably help convince them. If the rep who answers the phone can’t make this change, ask for a supervisor/manager and escalate up.

The credit bureaus won’t help you. Because in truth, you did pay it late. They don’t care why.

Also if you gave the current address on your credit application but they still used an old address it should be negligence on the part of GE money bank and you could threaten to sue them for defamation of character if they don’t cooperate.