I would be surprised if the money was being held in escrow and could be refunded. Actually the Trump admin is using this as an argument to the SC as to why making the tariffs unconstitutional is a bad idea.
Because I've ran into the same issue. I don't think this is actually the tariff. I'm almost 100% positive this is the shipping companies (UPS, and FedEx, but UPS seems to be the biggest culprit) are slamming receivers with massive bills because they are miscategorizing many items coming from Europe.