I recently purchased a $10 international calling card on
ozprepaidcards.com.au so I could ring to South Africa. After
registering for the service it took 2 weeks to get my activation code
in the post. After activating this and finally figuring out how to
find where the access numbers on are on the site I attempted to make a
call. The initial call connected through to a wrong number, when I
tired again the service just rang out. When I dialled in again I
discovered my credit was all used.

So basicaly I spent $10 for less than 10 seconds of calling to a wrong number.

I felt obligated to report this so I could prevent this happening to
anyone else.