I'm not sure if I'm seeing this right. The thread started in mid 2007. Now its already end of 2010. If he still haven't contacted you, then I guess its alright to let bygones be bygones.

If someone ever do start a dispute thread on you regarding the mentioned phone, you can always link them to this page.

If you do feel a bit guilty about that RM 70, perhaps you can donate it to charity at a mosque or something. That way both parties can get pahala for it.