Primary Production Research - E-mailing Production Companies

In conducting my primary reseach for production companies I e-mailed 5 production companies.
The e-mail I sent them said :
"Hello,
My name is Zac Bowen and I am an A-Level Student at Stratford-Upon-Avon College. My coursework scenario explains that I work for a production company (Silver Lining Productions), a multimedia company that has had recent television success.  We have being given the opportunity to prepare a pitch for and up and coming program. This program will be targeted at audiences similar to E4’s demographic (15-35) and will be suitable for pre-watershed broadcasting. Before achieving this we need to execute primary research into similar products, for this we would be extremely grateful if you could spare us a few moments of your time to answer a few questions regarding our research ?
How do you present your content to an audience?
When producing new or existing programs, what kind of things do you consider? Typical conventions for example
When conducting research into your target audience, what key aspects do you look for? How can you tell you are appealing to the right audience correctly?
And finally, how do you communicate with your target audience ?

It would be most appreciated if you could get in touch at the earliest of your convenience. Any information you can give will be a great help. Finally, if you are aware of any external sources you could point me towards, don't hesitate in doing so, as any information from your professional experience is valued greatly.

Regards,
Zac Bowen
Student
Stratford-Upon-Avon College
 Reply Forward"

I have recieved one e-mail back which unfortunatly contained no information helpful towards our research, this e-mail stated:
"Dear Zac,

Unfortunately we're very busy at present and as such are unable to assist with any academic research projects.
 All the best,

Jen"

I have yet to receive any other e-mails back from the other 4 production companies. This is very unfortunate as it would have being great to receive advise at a high professional standard and would have being very useful when conducting our own programme.