I've been on the cheapest Azure SQL DB plan (Basic + 5 DTUs) for about 10 months. Bills were low such as usage. I check the bill once in a while after checking my July one was really confused as it went up by 5 times. I went to the resource manager and found that the DB was scaled up by moving it to Standard belt + DTUs increased to 15 or so. I didn't ask for it, nor there was a reason to do that as it's still the same pet project which is still used only by me.
Could anyone confirm if it's a "normal" practice to upgrade my plans without my permission? In case if it dynamically scales up - how do I turn it off?