@PinkLizard: I'm sorry to hear that you're having trouble charging your Galaxy S10. Do you have access to another USB cable that you can try to see if the issue persists? Similarly, if you have a home computer, try connecting your phone to it via USB, to eliminate the possibility that the issue is stemming from the plug adapter. If the issue persists with multiple chargers, then head to the Samsung Members app > Press and hold the app icon > Diagnostics > Cable Charging, and follow the on screen prompts. Does you encounter any errors at this stage?