Reply from Trademe:

Thanks for sending the correspondence through, unfortunately we cannot act on any outside correspondence as it is too easily edited.

I suggest you come to some agreement with the seller about this situation and we will investigate their conduct on the site and take any action against their membership.

If you have further questions regarding this issue please reply and we will answer your email as soon as possible.

Regards,
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I thought the saga with Beatman is ended however, today I received another email with this message:

Would you like to cancel each other?s bad feedback.
No feedback at all!
Let me know?