Like if you want to update categories for your book, k dp will show you the message or email option only. Some support topics only show the Email option, while others do show a live chat and call option! You can contact kdp every Thursday between 4:00 AM to 8:00 PM PT by visiting their contact us page and selecting the relevant query section. As I mentioned earlier, there is no phone number listed on the kdp website to call them, however, you can contact them via their help or contact us page. Getting someone from kdp on the phone is one of the options that kdp shows on their help and support page.
