That's a good question. I know in my case it would be UPS as I have contractual agreement that assigns them as acting broker for export/imports.
It could also be Bitmain that is assigning HST codes. I know when I export large volume via other freight companies, I'm required to select HST codes as exporter on customs documentations.
I'd contact UPS before paying the bill. With Fedex I contacted them prior to paying. They said they would file a grievance claim on my behalf, during which payment would be put on hold and would incur no additional late fees. They did say it could take up to 6 months to resolve the change.
thank you very much!!!
ORDERING: I have gone to individual orders. One of the first orders I placed was for 8 and had to pay about $65. That was the last time I ordered in bulk on one order. Although it takes me more time, I place individual orders now.