GM Financial billing error

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Bumping, because It’s still ongoing. I turned the vehicle in on May 27th. I got a bill for disposition in June, paid. Bill for final taxes owed in July, fine, paid. Just got a amount due immediately letter dated 6 days after my final tax payment was posted. I called them, and the person on the phone assured me the account was closed showing $0 balance but I’m still nervous. Seriously, will never lease with them again after all these headaches.