If you only check and return messages once a day or once a week, let your caller know. This will avoid multiple messages by the same caller.
If needed, you have the option to send voicemails via email automatically. Besides, there is also an option to create greetings for your callers.

Of course, we want to know as soon as an incoming voicemail is saved, so again, it’s Twilio to the rescue. By adding a few lines of code to our Python script, Stacey and I each get an SMS notification telling us there’s a new message. Note that Twilio’s API requires a separate call for each message to be sent, which is why the similar code repeats once for Stacey’s phone number and then again for mine. If you plan to send bulk messages from Twilio, I expect that you can build a list of phone numbers and loop through them with the API call. Since we only have two contact numbers and don’t expect to add any more, I decided not to loop through a list of two elements.
Short Business Voicemail Greetings. Hi there, you’ve reached [your name] at [X company]. Thanks for calling. I'm unable to answer the phone but if you leave your name, phone number, and message. I'll make sure to return your call as soon as possible. Hello, you’ve reached the office of at [X company].