Hello I am a lawyer with over 15 years experience I will try to help you with this.
I am assuming from your question that you were over the limit and caught by the police. You will not be entitled to a copy of the call. If you are fighting the case you will be entitled to unused material but this would be restricted to material that either assists your case or undermines the prosecution case. The fact that someone called the police to report that you were drink driving and the content of that call fits into neither of these categories.