The advertised Azure Databricks pricing for NCas_T4_v3 series (NVIDIA T4 GPUs) is incorrect on the website. See https://azure.microsoft.com/en-us/pricing/details/databricks/
The advertised prices are much lower than they should be. The basic formula for Databricks is:
(Total Price) = (VM Price) + (DBU Price)
I am not sure if they are billing less than they should be or billing more than they advertise. If you used this series on Azure Databrick you may want to check your billing.