I'll try to spare you guys the detail of the crash. 

A friend was involved in a crash. The driver fled the scene. The crash was reported to Police by a third party before any other party made a report. The police immediately called my friend's landline and gave the call recipient the police incident number. My friend went to a station and reported the crash making reference to the existing number. Insurance claim lodged by my friend. The other driver claims the complete opposite version of events. The other driver's insurance company threatens my friend's insurance company. Friend requests and receives all the information on file. The witness didn't make a statement, but there is a blacked out section referencing their call.

Surely all that's needed is a quick call to the witness by Police. At this stage, it doesn't look like that's going to happen. The last email received cited privacy issues.

Has anyone had a similar situation where there are two versions of events and an anonymous witness that is unable to be contacted? What's the best way of getting this resolved in your experience?