I checked this and this is free but not for whatsapp.

NOVOCHAT-CHAT ON WHATSAPP, TELEGRAM, LINE & MORE IN 1 SINGLE PLACE

NovoChat helps you talk to customers on WhatsApp, LINE, Facebook Messenger, and
more, from a single dashboard.

* Facebook Messenger

* LINE

* Telegram

* Omnichannel Widget

* Resolve & Assign

* Agent Management

* Auto-Reply

* Support: Support Ticket





Posted by Ankit Sharma on Facebook
link: facebook.com/groups/2179325755493302/user/100007630329526/