To revise PO we need to ask WSG to revise for us and the person in charge is on leave.
we been delayed for many orders already.
Normally we could get factory to help with no need to revise PO,
just confirm on email then you can invoice the freight charge to WSG the same.
But if you really can not process without revision of the PO with add the freight charge.
So we really have no choice, just let the shipment more delay and wait until the person in charge resume to work and revise the PO as your requested.