I can not solve my problem with the either the helpdesk or the account health team.

Does anybody know how to escalate my case to a different (higher ranking) team?

I have found this on the Internet:

When you request a phone call from Amazon, ask to speak to the Captive Team once you're connected to a support agent. They will transfer you to a Captive Team member to whom you can explain the issue at hand.

Is that true? How to request a phone call? Does that team even exist? (Helpdesk told me that there is none else than them ...)