Build CPU charges from unintended preview builds: refund limit reached, can't open a billing case

Hi Vercel team. On team paul-mains-projects (project structural-learning-platform), receipt #2266-3916 came to $460.59, almost all Build CPU from preview deployments. Automated coding agents were pushing branches and every push triggered a full preview build, which we didn’t intend. We’ve since added an ignoreCommand so branches without a PR don’t build, switched previews to on-demand, and turned on Spend Management. The support agent says the amount is over the automatic refund limit and it can’t create a case for human review. We’re a small non-profit social enterprise for teachers. Could a Billing specialist please review a goodwill credit for these preview build charges? Happy to share any details.