How to recover a deleted broadcast group on iPhone?

Subhashkhanna wrote:

I mean Broadcast group of the WhatsApp group.

I am using some Broadcast groups to send my messages individually rather than in WhatsApp .one such group got deleted .

How to retrieve.?

That sounds like a great question for WhatsApp support. WhatsApp is not an Apple product or service.

Start here:

https://www.whatsapp.com/contact

What is a broadcast group? Do you mean a group chat? If so, see if anything here helps:

Recovering deleted texts and iMessages - Apple Community