Thanks for your info! Did you pay any bills during your 3-4 months dispute period? And what percentage of the credit did they provided you?
In the end we got 100% credit (forgiveness)
You ultimately need to sell the vision to GCP that you are worth more to them alive than dead.
I would include in your pitch the 37 specific measures you have taken so this doesn't happen again. And if another service goes wild you will catch it within an hour or two.