I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
Yes, you certainly can do that, and it may be a good idea if you want your yard done in the near future. However, you can expect the original contractor to complain and threaten suit if you do that.
To have the best chance of avoiding a lawsuit, or winning one if you are sued, try making a demand that the contractor work beginning tomorrow at 9AM and have a crew there at least 8 hours a day on all week days until the project is completed. Then if they don't show up tomorrow, fire them and get another contractor to finish the work.
This is a terribly common practice amount landscape companies that draw customers in, and string them along while the contractor takes on other projects that use the crew of workers----and this results in virtually all customers getting poor service. The only way to deal with these sleazy contractors is to call their bluff and give an ultimatum, and then fire them for breach of contract and failure to perform in a workmanlike manner. See this site for a definition of workmanlike manner: http://www.lorman.com/resources/-workmanlike-manner-defined-16419
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I wish you and yours the best in 2016,