I tried to help a business that received the exact same message as you. They had $7.500 on their account. We eventually gave up, as no one from Stripe answered

I tried to help a business that received the exact same message as you. They had $7.500 on their account. We eventually gave up, as no one from Stripe answered with other than pre-written answers. I even tried pinging them on IRC, but they couldn't help with these matters. They had no disputes, and Stripe provided no reason for the cancellation.