If you sue them they'll have to reveal what they think you did. Other than that you're probably only entitled to access to your data so you can transfer it to another provider, as well as maybe a prorated refund if applicable (and you'd probably have to hire a lawyer for that, too, because they possibly won't answer any further inquiries on your part).
You mentioned a university licence. Many vendors explicitly prohibit usage of such licences for purposes other than educational ones. This might be the cause of your problem, for example if you used your account for hosting a commercial application on Microsoft Azure.