Q: charging port is broken inside!!!!

Apple will exchange your iPod for a refurbished one for $199 for 54 GB 4G and $99 for the other 4Gs. They do not fix yours.

iPod Service Center- FAQ

https://support.apple.com/ipod/repair/service

A third-party place like the following may be able to replace the port for less. Google for more.

iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens

http://www.iresq.com/

I would not spend to much to repair that old model iPod.

I would consider getting an Apple refurbished 5G iPod. See:

http://www.apple.com/us-hed/shop/browse/home/specialdeals/ipod

Just note that only the newer/current 6G iPod can go to iOS 10