Regarding to the cost you mentioned, I also discussed with the Chinese agency, they mean these have to pay, please see the reply as folow:
1. CAF, this shipment is under fright prepaid why CAF is charges
2. PSC mean peak season surcharge right? if yes it's unreasonable to collect with us usually charges at origin
3. what is S/C charges? never paid before
4. port congestion surcharges, now in Bangkok this cost was canceled