Michael, perhaps it is the manner by which you contacted them as well? If you are saying that you contacted 15 over a week ago, I`ll presume that you either sent a mail, sent an e-mail or left one voice message. I`ll also presume that these are the top 15 people with whom you`ve decided to work. If that is the case, you need to be a bit more persistant than one contact in over a week`s time.
Take your list and call each of your targets. If you do not have a name, get them. Either briefly explain to the first person you connect with the department or person to whom you would like to be connected OR take nevadscul`s advice and speak with your distant industry peers about who they are connected to.
With reception, be clear that you are not looking to sell them anything but looking to be a distributor (this will keep you from being routed to voice mail automatically).
If you are connected to voice mail, hang up, dial again and ask if there is an email address to the person with whom you wish to speak and ask to be reconnected to their voice mail. Send your letter via email AND leave a voice message for them stating that you`ve sent it. Thereafter, follow up every 4 days, leaving a message only every 7 and always referring to your last message and emphasizing that you are looking to sell their product. If after 3 attempts you do not get a call back, return to the front desk and let them know that your call has not been returned and ask if they can refer you to someone else. (That usually triggers a "John, this person said they left you 3 messages" note from the front desk people.)
If you do not get their public email address, send a mail and refer to that mail in your calls.
Basically, you have to be a bit more persistant if you`re the new kid on the block. Good luck.
Tammi L. Coles
Archer Targeted Communication
Follow me on Twitter @archertc