Hi DS-FHF,

You’re right that the basic package, Simple Start, doesn’t have the option to set a schedule and email information for a memorized report. Therefore, you shouldn't receive an email after downgrading anymore. 

I recommend contacting our QBO Support about this, so they can pull up your account in a more secure environment and investigate this behavior. The steps to reach them and their office schedules are in this article: QuickBooks Online Support.

On the other hand, you can check out the article comparing the list of reports per QBO package. Just an additional reference.

I'm just around if you need more help with QuickBooks Online. Have a good one!