I am not surprised that your consulting company is asking money from you to run your payroll. i think they are asking you so that you can get the extension and I don't see any other options here unless you get the job or the company put their own money on your payroll which is highly unlikely.

i understand that these consulting are chors but think about your future too. this is a bad time so make your decisions carefully. if you are out of money ask your consulting company to help you if you worked with them for a very long time. otherwise, put some money in it, you'll lose some money which will go to Uncle Sam as a tax but you'll get an extension which will give you more money in future. 

this is a bad time.