Wow! You got an invoice? Was the invoice mailed after the fact or was it there when you went to pick up the package? Also, do you know if it was delivered by USPS or one of the private carriers (fedex, dhl?). Thanks!
My packages got mailed by EMS (Japan post) so it got delivered by USPS, the invoice came along with package, they delivered to my house and I paid by personal checks. If you couldn't pay when they deliver, you can come to post office and pay later then pick up the package. Basically you can't get the package without paying if there's invoices from customs.if you want to protest there's 2 ways : 1) you pay and get the package then send them info about the sale for them to re-evaluate the value 2) you don't pay but provide infos to USPS and they will send them out to customs office and hold your package til they get decision from customs.