ow.. sorry, i didn't read well.
Normally a big company have lot of people and everybody has his job...
Every mail is filtered, for example if you want to be hired the email is sended or redirected to recruiting to analyze if they want you, if it's an issue goes to support and so on. They dont have hired people to explain to a potential competition (you) how to success to create great games.
If you want a great company to explain you how to create good games you need to work for that company, you need to study and they are going to hire you but for very little money at first.