Mark I have had the exact same experience - every day Aramex customer service say "we will pick up tomorrow!' and then never come.  I finally gave up, cancelled the bookings and re-booked with NZ post.  Now when I list things for sale I don't use the 'calculate the courier cost for me' and instead say I will give them a shipping quote with their address as I cannot send Aramex.  They are not worth the trouble.