My Team uses CosmosDB heavily (so far, and not too far anymore) and it is another half-baked service. The support people are Indians (Microsoft outsourced Azure support to an Indian company - MindTree) and are not very knowledgeable on the CosmosDB service. They always point us to the URI of a web article (of course from Microsoft) and says everything will work if you follow the article, and close the ticket. Over the time, we understood that we know more than them on CosmosDB, and used to ignore their replies, but nevertheless raise tickets to make sure that they are aware.