Phone connection

[Wrootrhino]

Hello,

I have the bog standard concert audio system.
I have paired my phone with Bluetooth and all the call lists are populated but the phone book is empty. I have made several attempts and reset but it makes no difference. Has anyone got any idea how I can transfer my contacts into the phone book.

My phone is an Iphone13mini but Apple carplay does not recognise my car, it's too old, so I can't use that method.

Audi A4 Diesel B8k 143PS 2013

Thanks for your help

Regards

Bill