Help linking free and corporate account

Hi,

I have a free Box account and would like to link it to my corporate email so I would be able to open corporate Box links. My company won't allow me to create a full corporate account due to me not using it frequently and due to associated costs.

I found this was done before as per the post below and I posted there but I think it is inactive:

https://support.box.com/hc/en-us/community/posts/1500000032002-Delete-old-corporate-account-and-create-new-account-with-same-email-?page=1

I tried to post there but the lady who helped those people probably isn't with Box at the position anymore.

Does anyone know who I can turn to for help?

Thank you in advance