Asking me to add billing info but I want to cancel my trial and go back to a personal account

So I started working for a new company.

They asked me to create a new dropbox account.

I was supposed to make a personal account and then join the company dropbox.

But I made a business account and then joined the company dropbox.

and now, my trial is ending at the end of this month.

Dropbox is keep asking for my billing info.

And when I try to add it, it says it's going to charge me after my trial ends.

I do not want to get charged with anything. 

So I submitted a ticket to request a change my account from business to personal, hoping it will fix my problem. but still waiting for a reply.

Anyone know how I can keep my access to company files/folders after trial ends, without adding my billing info?

Please help.