As I've documented here, I was charged an extra $200 this billing cycle, https://news.ycombinator.com/item?id=47954005 and Fin / Claude their support bot accepted that it was an “unauthorized transaction” and said Anthropic would assist with cancelling it,
"Since this appears to be an unauthorized transaction that you didn't initiate, our team can help locate the specific subscription associated with this charge and assist with processing a refund and canceling the unauthorized subscription."
"Thanks for reaching out. This conversation has been closed and is no longer monitored. If you need further assistance, please submit a new request and our team will be happy to help."
I'm not the first person whose Anthropic account has been suspended under such conditions. It's likely that I won't be the last. If you don't trend on social media or HN, it's pretty hard to get any support. And it seems to be a common pattern / GOTO based on customer reports.
It's sad because I truly love their model. It has helped me so much with work and productivity, but it seems OpenAI has been working hard and now automatically adapts and migrates Claude.md files, extracts the "relationship-operating system" (GPT 5.5's terminology, not mine), and does its best to continue without missing a beat.