I used Dropbox.com to share some video files with some friends, which required me to have a paid account. It was a short term need. When I wanted to cancel my dropbox account, I mistakenly thought that I could just delete my account and that would stop the billing. However, it did not. I learned later that there is a way to cancel when I still had my account, but I could not get back in to use that approach. I repeatedly attempted to contact support and got no responses. Finally, after six weeks of failed attempts, I contacted sales so that I could talk with a person. Even the sales folks are not allowed to contact support directly. They did submit a ticket for me, but it did no good. After another two weeks, I eventually had to cancel my debit card so they would quit billing me. This was the worst customer support experience I have ever had. Not only did I have to cancel my card, which was a hassle, but I have no hope of being reimbursed for the two months when I did not use the service but was still being billed.