Can't log in minecraft or account

My friend couldn't log in his minecraft and told me to sign out and try as well on the new launcher.I tried it and my account couldn't log in i even tried logging in Mojang and it still didn't work.Can someone plz help me as i payed for Minecraft and all my money will go to waste if no one helps me.Can someone plz fix this issue as people who play this game don;t deserve to be treated like this.He has windows and I have a Mac.