Draft Letter of Complaint

Please, someone help me rewrite this letter of complaint in a appropriate and effective. thanks.

This is to formalize my complaint regarding my shipment to Trinidad
and Tobago with tracking number RQ070659090SG. As we discuss via phone
last 31 August 2012, I will demand full replacement of my item if the
shipment still not reach the addressee before he leaves to the given
address or not return to me on or before the end of the month of
September. The item was a cell phone, Myphone t23 duos complete set with micro SD 4gig.

I'm still hoping that the item will reach its destination soon. So
far, the recipient is still in the given address and waiting for the
item to arrive. I will inform your office if the item arrived or not
to the given address.