Unable to cancel disable subscription

Hi all,

A few days ago I activated an evaluation subscription. Everything was working fine until today that when I login and try to activate a virtual machine I get this message:

"Disabled subscription

Your account or subscription is disabled for security reasons.

We detected suspicious activity or terms of use violations and disabled your subscription to protect the owner of the payment instrument and Microsoft. If you believe this is an error, continue to submit a support ticket with the security team to review the decision."

How can I cancel my subscription? I don't want any charges on my account as it was only a trial subscription.

Can you help me?

thanks!