That sounds frustrating, especially after only two days of the Premium trial. If the login page is specifically saying that the account has been deactivated and that an email was sent with details, I’d check the inbox and spam/junk folder for that message first.
If there’s no useful information in the email, I’d contact Atlassian support through another account or their support/contact channels and include the account email, when the trial started, and a screenshot of the deactivation message. Hopefully they can clarify whether it was an automated security/account issue and help restore access.
The fact that you're still receiving the promotional and welcome emails doesn't necessarily mean the account itself is active, so I wouldn't rely on those emails as an indication that everything is okay.
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