Having read your initial post, and feel the tone you have used to some replies made to members, I am not at all surprised that you never achieved your aim with the seller, if, and I repeat if, you acted in the same way with him/her.
P.
Can I chime in with one little thing that will help anyone buying an used DJI drone. With the drone in hand and seeing the serial number, use your phone and do DJI chat. U can ask the agent if the drone u r purchasing is binded to an account and...