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If the prosecutor won't take your calls, write a letter and keep a copy of it for your records. Hopefully, if the police completed their investigation and presented it to the prosecutor, given the information you have related, no formal charges will be brought.
If your fiance was charge, because of the nature of the crime, if a victim advocate was appointed for you, then let s/he know about your conerns. If s/he won't talk by phone, again...write a letter and keep a copy.
Further, if your fiancee is charged, make sure that you attend any hearing dates that your fiance has. That way you can sign in when you get to court, and then ask that you be able to speak to the prosecutor about your issues.
If you are subpoeaned to appear in court, MAKE SURE YOU SHOW UP!! If you don't you could possibly be held in contempt of court, and also run the risk of having a bench warrant issued for your aarrest.
You are the complaining witness (victim). Your testimony will most likely be NECESSARY for the prosecution to sustain its burden of proving your fiance guilty of the offense "beyond a reasonable doubt." However, if there were other, independent witnesses that could testify as to your fiance's "bad conduct", then although your testimony would still be important, it would become less so because of the independent witness' testimony as to any alleged misconduct.
If by chance, after all attempts by you (and your fiancee's attorney if there are charges brought) to let the prosecutor know that you don't believe that he did anything to harm you, and it becomes necessary that your fiancee goes to trial, you will be called to testify. Again, YOU MUST show up for court. You will be placed under oath. The only thing you can do is tell the truth. If you do not believe that the incident happened, then you should say so. The prosecutor may call your 2 sentence statement into question, and try to impeach you on the stand...eg. "Were you lying then, or are you lying now?" Don't put yourself in the position of committing purjury. You can honestly say that you don't believe that the incident happened....you were drunk and said things while you were under the influence of alcohol that weren't true....the alcohol was talking, not you, and you made your "statement" while under the influence of alcohol.
Your fiancee's attorney could then ask you questions to rehabilitate any testimony that the prosecution poked holes in.
Also, the police officers who responded to the call will be put on the stand to testify. If they didn't see the incident, they can only testify as to what you said to them. They can't testify as to the actual facts. Also, while your 2 sentence statement may be able to be introduced into evidence, any police report is heresay.
If you were taken to the hospital and given a forensic exam/rape kit, that may be also be presented into evidence. Also, if you made any statements to a physician about your "condition", that may also be used by the prosecution.
But......all of the above being said, make sure that you keep trying by phone, letter or in person to be in contact with the prosecutor and/or victim advocate. Hopefully, you will be able to convince them of your position and the matter would be dismissed. Unfortunately, there is no guarantee.
Hopefully you won't have to worry about any of this because there is not enough evidence for the prosecution to even charge your fiancee.