Review I DON'T TRUST MAILPAC

They charged me $260 USD customs fees for a package. I re-ordered the same exact devices with the same weight, the customs fees I was charged for this second package was almost $700 USD. When I submitted the documents they claimed customs wanted, these documents were not provided to customs, because I immediately received a response from MailPac saying the charges are correct.
MailPac is not Jamaica Customs, so why are they calculating charges? Why they stated that customs needs to see the payment details when the submitted documents are not given to customs? They refused to provide a copy of the official customs documents for the shipment when I requested it.

I smell a stinking fish and I'm investigating and will take legal action because I suspect they are giving customers inflated customs fees.

I've taking my business to another company and regretted ever using MailPac.