Account Security, Report and Block
Protect your WhatsApp account from unauthorized access by setting up two-factor authentication. Also, be prepared and make regular backups of your chats in case your device breaks or you get a new one and want to transfer previous data.
Incidentally, it is now possible to report messages and contacts directly to WhatsApp. In any case, it’s a good idea to block people who bother you to ensure they can no longer write to you or send problematic content.