This task can be performed using Whatsbox
WhatsBox - The WhatsApp Marketing - Bulk Sender, Chat, Bots, SaaS
Best product for this task

Whatsbox
marketing
Self hosted - Bulk Sender, Chat, Bots, SaaS - automate your WhatsApp marketing, offer support, and interact with clients using reply bots. Now also via π± app.

What to expect from an ideal product
- Import contacts from your phone or upload a CSV file to quickly set up your sending lists
- Schedule messages to go out at specific times to reach customers when they're most active
- Create message templates with custom variables to personalize each bulk message
- Track delivery status and read receipts for all sent messages in real-time
- Set up automated replies and chat bots to handle customer responses without manual intervention