Support in shipping stuff to Quito from overseas

I have five packages from the same US shipper delayed, ie. stuck ln Miami,
for months due mostly to my inability to upload facturas and a return label
(one package has to be returned because it contains vitamins).

The Club Correos-Econcargo website is user unfriendly, at least to me,
and the two sister companies have not provided me with sufficient
customer service. Evidently I need more support from somewhere.

I am wondering if there is anyone in our network who can assist me in breaking the Miami logjam.

I am willing to pay for this service, especially to someone who has
successfully uploaded facturas and brought stuff into the country via
Club Correos-Econcargo, and who might be able to teach me how
to do this on my own going forward.