Help with accessing past employee personal accounts tied to biz billing

Hi Microsoft team, a rep from Commerce billing directed me here for answers. 
We have a team member that established a personal account with a business credit card that left the company over a year ago. The business card was recently charged for this personal account.
We do not have access to this personal account that was set up using an old employee email that has been since deleted over 1 year ago. We are struggling to get into a personal account where the charge in question is connected to our business billing and the since deleted business email. We need to access the account and see the information. The error says account does not exist. Can you please help us resolve this?