@Mustafa80
I'm confused. Did you use Instant Book or did you send a request to book to the host?
If you used Instant Book, the host does not need to accept, so what the host is saying makes no sense.
If you sent a Request to Book, it is not actually a booking. The host is supposed to either accept or decline it within 24 hours but, if they do neither, the request will expire after 24 hours and no booking has been made.
However, if you had the host's WhatsApp number (I assume you mean mobile/cell), you must have had a booking as contact details are not shared on the system until a booking is made. If a booking has been made, it would show up on your Airbnb account (and the correspondence thread with the host) as confirmed. Also, have you checked your payment method to see if money was taken?
Right now it is really difficult to get any timely response from Airbnb customer services. If I was you, I would try to call them and get someone on the line as they can sometimes take weeks to respond to messages.
Also, it's really important to keep messaging on the Airbnb system as proof of the discussion with the host. I know that you didn't get a response, so had to WhatsApp him, but follow this up on the Airbnb message system reconfirming what you discussed so that you have it there as evidence.