OpenAI just shut down our API access after years of no issues and completely normal usage, what to do?

Out of nowhere, OpenAI shut down our API access and has now shut down our team account. We are building an AI platform for marketing agencies, and have been consistently using OpenAI's models since the release of GPT 3.5. We also use other model providers, such as Claude and Gemini. We don't do anything out of the ordinary. Our platform allows users to do business tasks like research, analyzing data, writing copy, etc., very ordinary stuff. We use OpenAI's models, alongside others from Claude and Gemini, to provide the ability for our users to build and manage AI agents.