having issue with bills for minecraft education

We seem to have been charged twice for our student licenses. We made the initial purchase when we first set up the licenses, and now we've been charged again annually for some accounts, even though only six months have passed. Could you please look into this double charge and clarify why some accounts renewed so early? If this is an error, please let me know how to obtain a refund.

Also, I need to understand our cancellation policy. Please tell me the exact date of our next renewal so we can manage or cancel the licenses before the charge.

Finally, I'm finding the invoices difficult to read. Could you please send me a clear breakdown of the charges so I can understand how our billing works?