You can request a vendor credit or a refund for the missing and incorrect shirts you received from the t-shirt company.
Here's how to record a vendor credit in QuickBooks Online (QBO):
Go to the (+) Create icon, then select Vendor credit.
In the Vendor dropdown, select your vendor.
Depending on how you record purchases with your vendor, enter either Category details or Item details. Usually, this is the category, product, or service for which you’re getting credit.