skruglewicz thanks for the heads up.
This is the hidden cost of dealing with the cloud and not realising what is going on behind the scenes. I am glad you caught this before some serious charges occurred. But it should serve others as a warning about IOT central and any other cloud resources you decide to use. Also an internal counter may have been useful in persistent storage as well. I do believe the cloud side does have a dashboard which may have a place to monitor usage. Certainly if it does not, it would not be able to justify the charges.