Fulfillment Center, 9371 Canoga Ave, Chatsworth, CA – Parcels sent via the usps and stamps.com

I Have Not Been Receiving Parcels I Paid For, From Vendors Who Use This Fulfillment Center
The problematic fulfillment center being referred to is: Fulfillment Center, 9371 Canoga Ave, Chatsworth, CA 91311
I have been having difficulties with delivery for parcels that I paid good money for, that come through the USPS and Stamps.com

I went to the Post Office the other day and showed them some printouts of confirmation emails with my shipping address, as well as a screenshot of a USPS Informed Delivery message, an email from Stamps.com, and more.
The Post Office ended up referring me to a supervisor who took my tracking number from another vendor that I order products from and researched it. The supervisor came back to me with a printout showing me that the senders address had a range of apartment numbers that were: Apt G203 - G205. Of course, I do not live in a "range of apartments," I live in an "individual apartment," Apt G202.

[Note:] My apartment number above and the range of apartment numbers above are not my actual apartment numbers. They were changed here for privacy reasons
Continuing on, how can a fulfillment center who has a primary job of getting parcels to individuals and businesses, not know that the recipient will not receive the parcel unless it is addressed to an individual apartment, not a range of apartment units? Are they not in the business of getting parcels delivered? How can they demonstrate so much incompetence in their so-called field of expertise?

I logged into my account from the vendors that I order product from and they all had my correct apartment number and not a range of apartment numbers. So again, why such a demonstration of complete incompetence and an inability to use common sense?