Thanks for the update!
Based on the previous troubleshooting that you have done, it sounds like it's related to hardware rather than software. There is however one more thing that you can try and that is performing a software repair using Xperia Companion.
This will delete all data stored on the internal storage of the phone and reinstall the latest available software in your phone. So it's advised to backup the data using Xperia Companion before starting with the repair.
Should the phone still not charge past 83%, the phone will have to be examined at an authorized service centre by a trained technician. Your Local support team will gladly assist you with this and if you have any questions regarding service times, routines and so forth, they are the experts on your market and will assist you with this as well!
Keep me posted!
