[adambyrtek]

https://help.instagram.com/519522125107875/

"The data controller responsible for your information is Meta Platforms Ireland Limited, which you can contact online or by writing to:

Meta Platforms Ireland Ltd.

4 Grand Canal Square

Grand Canal Harbour

Dublin 2 Ireland"

The "contact online" link leads to the following form: https://help.instagram.com/contact/186020218683230

I would send the request both online and by tracked post with a proof of delivery. In the end your lawyer would do the same thing and charge for this at an hourly rate.