I have been charged for something not authorised

After I was charged of 176.13 euro unauthorized transaction, by Microsoft 365 Admin Center, I can't find any way to contact them to say that I would like to cancel my abonnement and want to be refunded back. When I try to access Support Assistant they said that I cannot connect with a personal e-mail address. I do not know what to do how to tell them I want to quite.

"How do I contact someone to get this charged refunded?"

Take a close look at your credit card and you'll probably see a telephone number you can call to complain about an unauthorized charge.

Hi, I'm John! I will help you with this.

Please sign in to your Microsoft account and review these pages:

• Services & subscriptions: https://account.microsoft.com/services see if there’s any active or new subscription

If there's nothing listed there, check order history:

• Please sign in to your Microsoft account’s billing page at https://account.microsoft.com/billing/orders
• Adjust the date range to include the purchase date.
• Then click “Show details” under each order to see what the charge is for.
• If it doesn’t look familiar, click “Order help” and then select “How to investigate a billing charge.” Follow the prompts to investigate the billing charges and find out more about them.

If you don’t see anything unusual, to help narrow down the issue:

1. How did you get notified about the charge? (bank alert, email, etc.)
2. What exactly does the charge description say in your statement?
3. Do you have another Microsoft account (work, old email, family member) where your card might be added?