Hello, Jaxnona. Welcome to the Community. We understand how frustrating it is when your phone will not fully charge in a reasonable time.
If the phone is slow charging or will not charge, this article contains several steps that may correct the concern. https://www.samsung.com/uk/support/mobile-devices/my-device-is-charging-slowly-not-switching-on-or-k...
In the event the phone is not charging and troubleshooting is not helpful, it is recommended to have the phone evaluated at an authorized service location. You can use the following link to find a list of service centers in the U.S. that can do the repair: http://www.samsung.com/us/support/service/location
For assistance outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html