You mentioned quite a few details, from which i can conclude this:-
1. You are targeting a Brand and all your accounts are getting banned back to back
2. You think you are using branded keywords and due to that your accounts are getting banned
First of all, use a general website, like bakery or flower delivery, that is very safe for google ads, then, use that keyword(branded) in that campaign, if it is still suspended, your whole set up is fck'd up.
It can be YOUR
IP
Mac Address
Billing address
Credit Card
Email you use to sign up google ads
Ad Text or Ad Structure
Could be literally anything, so no one can help you exactly here, unless someone checks your accounts and determine what the issue is. I bought a batch of google ads accounts of 10 accounts, just to figure out what was suspending my account, it took me 1 week, hundreds of dollars to determine the issue. So before you ask a question here, ask yourself, do some research and i am pretty sure, you'll be able to find an answer.
As far as branded keywords is concerned, some of them you can use and some may suspend your account even before your ad text gets "Eligible" to run.
Hope this answers your query !