AFP-JIJI                                                                               Jan. 14, 2014
FREETOWN – Eighty percent of people phoning a toll-free Ebola help number are prank callers, the head of the Ebola Call Centre in Sierra Leone, Reynold Senessie, said Tuesday.

“Such prank calls are affecting the smooth operation of the center,” Senessie said while briefing Palo Conteh, head of the National Ebola Response Centre (NERC), who paid an unannounced visit to the call center.

The good news is that “genuine calls are dwindling and response to such calls have been swift,” he added.

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http://www.japantimes.co.jp/news/2015/01/14/world/science-health-world/calls-ebola-center-pranks-sierra-leone-official/#.VLa5BXu1f8w
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Use of a Nationwide Call Center for Ebola Response and Monitoring During a 3-Day House-to-House Campaign — Sierra Leone, September 2014

CDC detaied study of call center useage in Sierra Leone

See complete study.

 http://www.cdc.gov/mmwr/preview/mmwrhtml/mm64e0113a2.htm?s_cid=mm64e0113a2_w