Unauthorised credit card deduction

I made a credit card payment for an annual subscription to Microsoft for Office 365 on 23 December 2020. On 11 February 2021 there was a second deduction that was made on the same credit card with no authorisation from me. This is not what I expect from a professional organisation. When I notified them via e-mail there was no acceptable response. I then contacted them on their chat service. They told me that I had two accounts one a Gmail and one an Outlook and that if I closed the one that they would refund me on my credit card. This was on 17 February I have notified all my contacts to only use the Outlook address, but they have not closed the Gmail account, nor have they refunded me the second payment. This is not what you would expect from a professional organisation, and besides this I was under the impression that Gmail was free! Should I not get any further feedback and a credit to my account I will go to the bank and ensure that they can no longer make any deductions and Just not pay them again.