You can report problems with an order through your printful dashboard. Watch the video below to have a look at the steps needed. Be aware that Printful may require a photo to be submitted with your problem report to begin a reshipment. It is always best to include photos with your initial problem report to avoid delays.
Finding an order in your dashboard
Reporting a problem with an order
Log into your Printful account
Find order in your orders page - search using order number
Click on order to open order summary
Click "Report" to open problem report window
Write up your problem in detail and upload relevant photos where possible