Contact at Charter Communications?

Hello, I apologize if this is not the appropriate place to ask, however we have been trying to get in touch with someone at Charter Communications to see if they are blocking part of our IP range and have been unsuccessful in getting in touch with anybody.  I've contacted both the email address and called the phone number listed under the tech contact for brighthouse.com (which is the domain in question) listed on whois.icann.org and have not received any response.  Would someone please contact me off-list with someone who I might be able to reach out to in order to check on this? Thank you! -- *Chris Rhode *Network Engineer University of South Florida – Information Technology crhode@usf.edu <mailto:crhode@usf.edu>