I am currently on a Zoho Mail trial plan but would like to upgrade my plan to get more e-mail storage.

The problem is that I only want to upgrade for 1 user since I am only 1 user, but the system only lets me upgrade for 3 users, because my trial basis for some inexplicable reason is for 3 users even though I have never been more than one user, see the attached file.

How do I upgrade for 1 user?

Best regards,

Thomas