Office 365 subscription disabled for fraud- Help?

While I'm sure this could be handled in a more chic fashion, there are lots of (spam) parties firing up trial tenants for spam runs etc. Now, trials can be converted to paid subscriptions, and extended one time - trial periods are not infinite. A trial tenant in principle temporary and meant for demonstration or dev/test purposes while it is in trial. Since you were using it more in a production kind of way (and perhaps one of your users sent a bulk mailing?), something triggered a mod to use their ban hammer. I'm sure you can escalate through the proper channels; you have an e-mail from MS with a statement contradiction their closure action.