Business ProfileforAmerican Post 'N' Parcel

I left 4 items - a package with 2 toy James Bond cars, a tan and white round straw tray with handles, gift package of 16 various scents, and a FAO Schwartz mug and chocolate set - at American Post and ****** to be packaged and shipped to my relatives in Marietta, GA on December 2, 2021 around 5:15 pm pacific time.The owner charged me $88 and stated he sent the package via UPS because it was cheaper than the post office. When I got home, I noticed the receipt did not have an UPS tracking number so I called to ask for it. A lady who works there gave me tracking number 1ZXXXXXXXXXXXXXXXX. I entered the number on the UPS website to track it and the site showed the number as invalid, please contact sender. I called American Post and ****** and **** told me since the package was left at 5:15 pm, UPS had not entered it into their system! Since American Post and ****** is an authorized UPS shipper, he would have scanned the label on the package and it would have entered UPS system as label created on 12/2/21 at 5:15 pm. I know whenever UPS picks up packages, they scan them when the label is created. Nevertheless, I said okay. On Friday, I entered the tracking number again on the UPS website and it still came up as invalid. I emailed, faxed, called American Post and ****** but received not response and no resolution to where my shipment is or the correct tracking number. I emailed and faxed them again on Saturday, 12/4/21 but received no response. It is now 5 days later and I have not heard back regarding my inquiries. Please help. Thank you.