How to Escalate a Google Ads Support Complaint & Request a Rep Replacement?

If a Google support representative is not performing their job effectively—sending generic, poorly written responses, failing to address the actual question, or struggling with English—what is the most efficient way to report them, request a replacement, and escalate a complaint to the regional level? Additionally, I would like to understand the specific terminology Google uses to describe roles and titles within their support hierarchy. While I have successfully had a representative replaced before, the process has been long and difficult, often complicated by the rep seemingly attempting to create confusion. If I knew the exact terminology Google uses to describe its support hierarchy, I would have a better chance of effectively navigating the escalation process, requesting a replacement.