You have to contact the vendor directly referencing the PO number that PEFS Purchasing provided you in the confirmation email.
When inquiring about a shipment for an item already ordered with a PO, the first step is to contact the vendor directly.
If the vendor is not helpful then you should contact PEFS -Purchasing to intercede on your behalf.
Please email purchasing@seas.upenn.edu if you continue to have concerns about receiving your product(s).