Hi, I saw your post and found that it can be done within minimum 8 days.
As u mentioned in your post, you need a script to recognize the number in audio.
So you can implement this using AI and Machine Learning. Using these technologies will make your work much better.
The service on mentioned technologies will be fulfilled.
Additional services like testing, Documentation is available.
The proposed bid is negotiable as your need.
Here is a team of 3 full stack developers, ready to serve at any technical platform. Contact for more information.
Thanks for posting.