If they are paid, try sending them a GW( goodwill letter)
If they are not paid, try sending a PFD ( pay for delete) letter
If they are not yours, or you doubt what is showing up, send them a DV ( debt validation) letter
Jsut do a search for whichevr you need in the forums, and ALL the information you need will be there! It takes hard work, and a lot to do.. but stick with it... some do get deleted if you stick to it!