Samsung discontinued all cameras in 2016 in order to focus on appliances and mobile devices. It seems that the camera has sustained some considerable damage, as you said that buttons and WiFi are not function anting correctly. From doing a quick Google search, it looks like you’ll have trouble finding instructions and/or parts online.
My suggestion, if you are willing to take apart the camera, would be to check the position of the buttons behind the housing. It could be that whatever is holding the buttons against the housing has been damaged and so the buttons are not working as intended.
I’m not sure if it will be possible to fix the WiFi, but it seems like a minor inconvenience. If you can repair the buttons, I’m sure you’ll be able to live with a cable. If not, time to get a new camera or splash out on third-party repairs. Good luck.