If u bought it brand new. If u dont get a proper battery life as expected u can claim warrenty .However u may need to exclude unwanted Apps that can drain your battery , if u r using dual sim and 4G all day long weak signals can drain battery eay fas...
I think u have tried most of the things .Did u try a different charger to rule out its a chager or cable issue ?If it doesnt work with another charger then u probably need to clean the port well or its a type C port issue .If its within warrenty peri...
Ram plus is a virtual memmory .For samsung s24 ultra /24 plusWhich has a 12GB ram this is actually not needed .It is basically usefull for phones with lower RAM .Please concider hitting the 3 dot menu to accept it as a solution if u think my comment ...