Do keep in mind that anything out of the ordinary, or too long will eventually grate on the person listening. My sister recorded a message similar to the one on the film Terminator, where the message says "Hello" and then pauses so that the person on the other end thinks that they are talking to a real person, before revealing that it was a trick.
What happens here is when you apologize and sound genuine in your tone, your prospects would understand and leave their contact details for you to follow with them.

Whether it’s an out-of-stock product, a canceled event, or social media snafu, there are times when your business may see an influx of frustrated callers. While it is important to address their concerns head-on, you may not be able to answer each call as it’s received. Make sure you use best practices for dealing with angry customers, and that your voicemail greeting sets the appropriate tone. Avoid defensive language, validate their concerns, and keep them informed as to how you are handling the situation.
We suggest you create a script beforehand with the text of your message, and then read it while recording. Be sure to record away from background noises or distractions.