Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Please note that you are not communicating with Microsoft here, only with your fellow users.
I paid to download 365, but the first download failed. The following day I started over and the download was successful. But now I have been charged for two downloads.
If you ordered a subscription twice using the same e-mail, the two subscriptions would have been added together. Your account at https://account.microsoft.com/services will show you that info.
If you prefer to cancel the subscription, you should be able to do that as well from your account. See also https://support.microsoft.com/en-us/account-billing/cancel-your-microsoft-subscription-c2c6b0e3-cab3-cb98-d83e-c9ad54620530 .