New usb-c charger stopped working.

Hello,

It's very rare for the adapter to fail. Check for other reasons for why your phone won't charge:

If your iPhone or iPod touch won't charge – Apple Support

If no help, take the adapter & packaging to an Apple store so that they can check it. If it is defective they will probably replace it.

Good luck.

Hello,

Is the charging adapter genuine Apple? See this:

Identify counterfeit or uncertified Lightning connector accessories

Otherwise, check the charging port for lint or other debris and see this:

If your iPhone, iPad, or iPod touch won‘t charge

Good luck.