Do not think there is anything you can do. Credit card banks can decide if or not they want you to be their customer.
1. You open CCs on behalf of AU and you do not even use some of your own cards.
2. The $20k to $25k per month spending is beyond normal (for most of us) and this from AU alone. It raises more than just one red flag. We do not even know what charges those are. Personal uses?
3. Excessive disputes from both primary and more AUs. With the lost dispute, it means the dispute was not even legit.
4. Bounced payment.
5. Multiple AUs.
It is worse if those AUs are not your immediate family. We do not even know who they are. Clearly you did not manage your AUs well. The AUs ruined your finance. You need to get rid of them and just move on with another CC bank.