Hi Rehan,
This is a very common scenario in businesses when an employee sets up a subscription using a corporate card but the account details are lost or the employee has left the company.
Since this is a public community forum, no one here has access to Microsoft's backend billing systems to look up your credit card details. Because you do not have access to the original account, you cannot use the standard Microsoft 365 Admin Center to update the payment method.
Here is the official and most secure way to resolve this:
Contact Microsoft Business Billing Support directly via Phone:
Search online for the official Microsoft documentation page titled "Global Customer Service phone numbers".
Find the dedicated Business Support phone number for your specific country/region.
When you call, navigate the automated menu to reach the Billing department for Business/Commercial customers.
Explain the situation to the support agent. They have the internal tools to securely look up the exact Microsoft account or tenant associated with that specific credit card number.
Once they locate the account, they will guide you through a strict verification process using your company details and cardholder info. After verification, they can help you either regain access to the account to update the card, or cancel the subscription entirely.
A quick alternative approach: If you eventually have to block the card at the bank level, the recurring payment will fail. The Microsoft service attached to it will eventually be suspended. When that happens, the specific employee or department using that service will likely report the outage to your IT team, immediately solving the mystery of who owns the account!
Hope you get this sorted out smoothly!