So I’ve come back from uni and my dad flattened the battery in the car (a new battery) and was recharging it back up. It was reading nearly full on the charger and I needed to go out so we unplugged it. The car wouldn’t start. We plugged the charger back in and it super low charge again. We then tried to jump the car using a brand new battery and it wouldn’t start it. Not really sure at this point what to do or what is wrong with it. Any help or suggestions would be greatly appreciated.