No Feedback from the CEO's office

I have sent an e-mail to the CEO's office but I blatantly do not get any response. An acknowledgment of receipt e-mail would be appreciated but I received nothing in the sense of out of office response or that someone will attent to my e-mail.<br> How poor is this for customer satisfaction?<br> Mumsie is the Head of Department and she blatantly refuse to response. Who may I report her lack of interest to and how long before I will receive a response on my e-mail that I have sent to her.<br> <br> Please ensure that when you respond to me to provide me with Mumsie superiors details so I can report her lack of interest in customer satisfaction.