WhatsApp message forwarder multi chat to a single chat.

Subject -
Hey guys I am working on a project and I need a bit of help. The requirement is that the client gets messages from different lead generators and he wants all the leads in a single chat.

Issue -
Now the issue is that I cannot use the client's number in whatsapp cloud api as it'll clear all the previous data on that number. And I cannot update the number that lead generators use as well.

What do I do ? How do I get the incoming messages from those leads and forward it to a single chat ?