Incorrectly identified as an advertiser

We have observed recently that an upstream list provider has incorrectly identified our domain as an advertiser and or spammer:

# [3cinteractive.com]
0.0.0.0 3cinteractive.com

Our company does not engage in online advertising or e-mailing campaigns, however this 'blacklisting' may prevent existing or new customers from accessing our services. Please advise us on what steps can be taken for the removal of this entry.

Sincerely,
William M. Nett
wnett@3cinteractive.com