Money taken out of account

A ********** transaction took place on my account. Bank says it takes 14 days to investigate and to prove it was not me that did the transaction. Surely I would not be in the back querying this if I had done the transaction. How ridiculous because now I am left with no money. Why can't they just reverse it as it has still not been processed. How many people are left in this situation because of *****. And the response I will get is that the case has been assigned to so and so and someone will contact me within three days. That does not help me when all the money in my account is gone. What must I do now, apply for credit and create extra costs because of someone else taking money out of my account???