Remove ******* ITC listing

My credit record has been damaged because I no longer have a policy with you. The listing says that I owe Discovery an amount close to 2700 and I have no idea how that's the case. I have never received a call notifying me of an outstanding amount I owe to Discovery. I need this listing removed as Its affecting my credit score. This listing must be removed ASAP as it has been on my record for 6 months and I have been unaware. Its not fair