Miscellaneous topics that do not fit into specific categories.
Hello, good day and thanks for your question. As you have an existing subscription, you will need to cancel it first and then you can go to https://account.microsoft.com/services/microsoft365/billing and try it from there or try to turn off the recurring billing at https://go.microsoft.com/fwlink/?linkid=2277073 and you can also follow the guided steps indicated from the link below.
You can also request a call back by going to https://go.microsoft.com/fwlink/?linkid=2168171 in case you are having trouble cancelling and getting a refund.