advice please - Device to track how a delivery company handles our parcels

pert:
USPS refuses to take any responsibility even when their geotracking shows the package was delivered to the wrong address.

OH YES.

I had this with another international carrier, 3 weeks later had a demand from said carrier for customs duty and vat.

I did not receive it but had to pay tax despite not having it.

Got quite unpleasant.

With UK postie i have to pay first to collect and can refuse delivery.