Dropbox Sign appear to have been billing my card surreptitiously for over a year.No payment notification was ever sent and nor was an invoice ever produced in line with UK statute. Money was simply taken from my card.When you login to your Dropbox account, you'll find no record of any account or billing information and thus no means to cancel. Only when you contact Dropbox do they inform you that apparently Dropbox and Dropbox Sign - despite sharing branding, a web domain, user data, a customer service team and both platforms having signature functionality - are apparently totally separate entities and thus one can only find their billing info, and cancel their account via a separate subdomain.When you ask for your money to be refunded, you'll be pointed to the terms of conditions that were linked in the small-print when you signed up for a free trial. These terms will state that they can bill you without an invoice, that that they'll never give any refunds.Their sign-up and billing process appears intentionally designed to quietly bill people for accounts they're unaware of, make detection of this fact more unlikely and make finding the account and cancelling it more difficult. I highly recommend that you find alternatives to working with Dropbox.