Need urgent help

Hi, I just found that my engine oil is empty. IT is not even detectable at all. It must be leaked out gradually. It is only 3 months since last time I changed engine oil. It must be a slopy job by yen's auto in berkeley again. THis is sencond time, last time they made my transmission oil completely leaked out and messed up my garage, and I had to rent a car to go to work for one week since they happened to close for that week. They close for weekend. Is there any thing I can do to avoid getting my car burned. Thanks.............