This is really a tricky question.
If you are an Azure or GCP customer, you can open a support ticket with your respective cloud providers and they will be able to provide you with the details.
If you are an AWS customer and have a support contract you can open a support ticket with Databricks. If you don't have a support contract, then you might need to look back at your old emails where you had conversations with our sales team. You can reach them via their email and get the necessary information.