Sorry to hear that you had an issue powering off your droplet, and sorry for the late response! The best way to get help is to open a support ticket right in the DigitalOcean control panel. The team it on 24/7 and will provide you with much quicker support than posting here.
Powering your droplet off via the command line is usually a better option. Using the button in the panel is the same as hard resetting the server. On the command line, you can run: