If voicemail is off, make sure to use a greeting that doesn't instruct customers to leave a message. For details on creating greetings, see Creating a custom greeting. Phone lines and digital lines
Another worth considering trick is to remove all the old voicemails that are consuming the storage and creating multiple dilemmas like this. To delete the voicemail here are the steps, Open the Phone app. Tap on Voicemail at the bottom tab. Then tap on Edit at the top-right screen. Select All the Voicemails and at last tap Delete.

There’s nothing more crucial to your business than the image you create to your customers, community, and your prospects. With a lot of fly by night and home based businesses today, it is more crucial than ever to show your business company in right light and to tell those that make business with you that you’re a trustworthy and credible entity.
Businesses should have two main types of greetings to create an excellent call experience. The first one is what we call a “welcome greeting” – this greeting welcomes callers to your business. Typically, a welcome greeting will present a menu of call options like hours, location, or customer service. For more details on how to create a welcome greeting for your general business number, read this article.