I'm a bit worried about this too, especially because I sleep odd, always shifting hours.
I think I'm going to setup a Twilio app which tells customers that we'll call them back within 24 hours. The app could ask "When is the best time to call?" and "Please briefly describe the reason for your call". The app could be interruptible if I am awake and available.
Or voicemail. But if you want to really empower your users, let them pick a time to be contacted and then call them then. Voicemail is leave it and forget it and when I call a company and leave a voicemail it feels like a black hole that my message may never escape. Maybe that's just me.
I think I'm going to setup a Twilio app which tells customers that we'll call them back within 24 hours. The app could ask "When is the best time to call?" and "Please briefly describe the reason for your call". The app could be interruptible if I am awake and available.