WhatsApp broadcast lists setting up

Description

Hi,I do property rentals & sales.I am receiving multiple customer enquires from my advertising. I would like to be able to add my customers phone numbers, into a WhatsApp group. I then will want to send one single message, the same message, to ALL of the customers in my WhatsApp group.
But, when a customers replies to my message, I do NOT want the other customers in that group to be able to read their reply to me.
How can I best do this, what do you suggest.... also, if i give you the customer numbers, could you also upload the numbers into whatever group is most suitable?
Thank you