I recall an incident at my old company where we were under DDOS, it was getting through cloudflare and saturating LBs in some complicated manner (don't recall the exact details) which made it hard for us to fix ourselves. They were on the phone with us for hours, well past midnight their time, helping us sort it out. The downtime sucked, but I was certainly impressed with their truly excellent support.
But again, you get what you pay for.
"I'm in Hawaii on my honeymoon and my backup missed your call, so it escalated."
I probably wouldn't have answered the phone. Granted, that's why I don't do that job. But I have always had a real appreciation for the good TAMs ever since.
It was not a wise plan. It did, however, run. Technically.