Ash here from the Shopify team. Welcome to the Shopify Community!
I understand you're running into an issue accessing your Shopify account, and are running into an error stating "This store is unavailable". This is an issue that our Account Integrity team will need to address, and you've taken the correct steps in getting that process started by submitting a support ticket. Since these situations involve sensitive information, they are not something we can address via the Shopify Community Forums. At this time, the best course of action is to continue working with our team in your open ticket, and awaiting a reply there for next steps.
For anyone else experiencing a similar issue logging into their account with the error message stated above, please reach out to our support team via the Shopify Help Center by opening a live chat, phone call or email ticket.