Hi Brian,
Since you already have a Microsoft Support case number, the best option is to contact Microsoft Support again and provide that case number so the support team can review the history of the case and continue assisting you. Please note that Community members do not have access to support cases and cannot contact the technical support team on your behalf.
When you reconnect with support, have the case number ready and explain that the issue remains unresolved and that you are trying to re-establish contact with the original support team. This will give them the best chance of locating the previous case and reviewing the work already performed.