The most important thing is whether the user had an employee, administrator or owner profile. If it was employee or admin profile it is not a problem to delete this profile from company account. You can write an email to our adress firstname.lastname@example.org with request to do this action.
Whereas, if the user had the owner profile and you have only employee or admin profile, we need to get a request to change the account owner directly from the current owner. We cannot change the account owner without him explicit permission.