iPad Pro charging port

Issues with the iPad USB-C ports are not frequently reported here. If you are experiencing repeated issues with multiple devices, this might suggest either a problem with the USB-C cables that you are using - or a potential handling problem.

Are you using USB-C cables of Apple origin - or other third-party certified USB-C cables? Uncertified cables, often cheaper than properly certified cables, are unlikely to meet the stringent electrical and physical connector specifications - and can cause damage.

As for handling issues, while USB-C sockets are relatively robust, they still require some care with connecting and disconnecting cables - ensuring that once correctly aligned, connectors are inserted or removed squarely without undue lateral pressure.

The charging port stopped working completely?

Are you using The Apple USB-C Charging Cable and Charging Brick? (Many 3rd party cables / bricks exists, some can actually damage devices)

I would visit The Genius Bar, Apple has Genius Bar programs where they cover devices that might stop working properly (ie. Butterfly Keyboard). The Genius Bar Technician can tell you if your iPad Pro is covered under one of these programs.