Lighty

Hi All, I am at my wits end trying to get a straight answer out of immigration regarding the process involved in getting my most recent sponsor to pay for my flight home. Essentially I want to leave in the next week or so and as such do not want to wait for 30 days to get a response to the written request I put into my last employer a few days ago. One immigration representative said I can book my own flights and invoice my employer for the cost and another said I need to wait for my employer to book them for me. The first option is my preference and was I'm wondering if anyone had success doing it this way? Thanks in advance for any advice that can help me out!