New Australian Post RIP OFF

I sent an item in 3 kilo satchel & it was returned to my local post office about 8 days later..

The post office left me a collection card with request for $13.40 return postage charge !!!

The tracking showed the parcel was delivered but there was a problem with either

wrong address (no it was correct address) or the buyer not home & failed to collect at post office...

So where do we stand as sellers? we either retrieve the item & pay the return post fee or refund the seller and leave the parcel

with Aust. Post?

either way we loose...