What kind Whatsapp chatbot system do you need?, As for CRM system do you need something similar to this(Jobber, Housecallpro etc.)?
As for the design and development cost , I can't think of an exact price for this kind of project since I don't know the end goal , overall scope , process and User flow of your project so that's why it would be best if we can schedule a meeting session through freelancer and later on we can discuss the timeline , budget structure , milestones.
So let me know what do you think about this,
Regards,
IR.