Get your taxes done using TurboTax

I received a security alert that someone is using my information to file with the IRS. It looks as though my account was accessed approximately 13 hours ago. This was not me. There is supposed to be a 48 hour hold on this filing but this is the weekend and I am unable to speak with anyone at TurboTax. The hold will lift before their business hours resume Monday morning. How do I stop this from being filed?