As far as I'm aware the wording that pops up on the phone's display when starting charging the phone has changed and no longer says ' fast charging. '
But if one goes into the battery settings it should say fast charging there.
If your phone still isn't fast charging then let a Samsung Service Centre take a look if you can @Cath123
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "