An officer came to the scene and took your statements, albeit apparently without creating a formal report. You knew enough about this officer and his name, such that your boyfriend was able to contact him and speak to him about the incident.
Now some other officer, who for undisclosed reasons you believed to be the same officer who came to the accident scene, states that he was not the officer who responded. It sounds like you need to talk to your boyfriend and figure out who the officer involved actually was, then speak to that officer.
You can also try speaking to a supervisor.
If there was a 911 call, there will be a record of the call. If a car was dispatched to the scene, there will be a dispatch record.

