Surprising Refund and Support
I found out like others that I had somehow been subscribed to a charged version of Dropbox I was unaware of - but I didn't know which email it might be associated with to be able to log in and cancel it. Felt like a dead end. In the end I used another email to sign up to a Pro account on trial for 14 days, simply to get support. I did get the support and not only was the original account cancelled, but DropBox also refunded the annual fee which had appeared in my account and alerted me to the problem. I then cancelled the trial I had opened and was not charged for that. Not easy but I was very surprised DropBox offered to refund the Annual Fee, even though I had not expected or asked for that.