Non-existent shipment scams

They send me emails pretending to be from Correo Argentino, OCA, and Andreani saying they have a package held. Some say I have to pay a certain amount to unlock the process, and in other messages, they ask me to open a link because my details are missing in the shipment. They send me a tracking number that doesn't exist. I went to one of their websites and the package doesn't exist. Surely, these are all scams.