Can’t access SUPER ADMIN account

Hello everyone,

I am having this issue:
I have a client that has a wordpress multisite and their only login credentials have the Role of Administrator which does not grant access to the Multisite Network dashboard. All users are registered as admin or editor, none has SUPER ADMIN.

We need to verify and update the theme, the plugins, etc and we cannot seem to find any option to access the Network Dashboard and my client does not have any other login option or does not have the contact if the person that created the multisite years ago.

Is there any way we can solve this and grant them suer admin credentials?