I believe Black Knight Financial Services Company bought out ServiceLink.  "Fidelity National Financial, Inc. (NYSE:FNF), a leading provider of title insurance and transaction services to the real estate and mortgage industries, today announced the reorganization of the former Lender Processing Services, Inc. ("LPS") businesses, the formation of a wholly-owned subsidiary called Black Knight Financial Services, Inc. ("Black Knight") and the issuance of a 35% interest in each of Black Knight's two operating subsidiaries, ServiceLink Holdings, LLC ("ServiceLink") and Black Knight Financial Services, LLC ("BKFS"), to funds affiliated with Thomas H. Lee Partners, L.P. and certain related entities. Black Knight, through ServiceLink and BKFS, now owns and operates the former LPS businesses and FNF's ServiceLink business. FNF's core operating subsidiaries now consist of Fidelity National Title Group, Inc. and Black Knight. " 

That quote was on Fidelity's website.

 I believe others have had problems collecting recently.  I refused to work for ServiceLink starting a long, long time ago, but have friends who have struggled to collect.  I think you just have to track down whoever took over the accounts payable for ServiceLink at Black Knight.  Probably a web search will at least get you a general phone number.