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Can I know how you realised that someone is using your number on WhatsApp? Any specific evidence or example?
Do you still have that message on your phone at the moment? If yes, a screenshot of it?
During the period of time when you were not with your phone, including the period when the phone was with Apple, was there any chance for your ex-wife to access your phone physically?
Basically, you may just install WhatsApp and register with your number on your new iPhone 11 Pro Max.
As soon as Whatsapp gets started from that number on your own phone, the person, if any, having access to your account through WhatsApp will stop.
Only one access is allowed on WhatsApp through one number.
If you suspect someone else is using your WhatsApp account, you should notify family and friends as this individual could impersonate you in chats and groups. Please note, WhatsApp is end-to-end encrypted and messages are stored on your device, so someone accessing your account on another device can't read your past conversations.
FYI - The official WhatsApp guide - Stolen accounts
I have answered above. I paste it again.
As advised, you may just install WhatsApp and register with your number on your new iPhone 11 Pro Max.
> using another person WhatsApp?
Do you mean you are worried about if someone else is still using your WhatsApp number or accessing your WhatsApp messages?
As advised, if you have just register WhatsApp on your iPhone 11 Pro Max, no ANY one can access your WhatsApp number and see your messages. Simply because Only single access is allowed on WhatsApp through one number. That's the rule of WhatsApp, and that's how it is designed.
If you are not sure, just uninstall WhatsApp from your iPhone 11, then install it again and register the phone number again. That's it.