As the GCP public documentation indicates, if your billing account remains invalid for a protracted period, some resources might be removed from the projects associated with your account. For example, if you use Google Cloud, your Compute Engine resources might be removed.
Removed resources are not recoverable, the best option you had was to review your case with tech support and have a more specific answer, I noticed that there isn't any way to recover resources 30 days later it had been removed, this is also described in Data deletion term, including existing copies.
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