Work contract terminated - priced as bulk.

OK... so, I'm a contractor. I use an online work platform. Recently, I got an offer to hire my services out at around $140/day for nine days.

Now, that's not a great rate for the DC area, but I was willing to work it, because it was for nine days.

I've worked for this company before, and when I did, not only did they give me the full hours on the ticket, but they called me back for the next site. This time, though, they cut my contract by six days, citing "scheduling." They're flying in someone who works for them to finish the project, and letting me go before my contract is up.

How do I get more money out of them?

I'm in VA.