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Hello Katrina, sorry to hear about your experience thus far. Regarding cutting your losses and hiring someone else, all states are different, but a contract cancellation clause should have been outlined in the contractor's contract / scope of work. If it was not spelled out in your contract, you might want to contact the licensing board in your state for additional information. Next step would be contacting an attorney.
Check out this "How It's Made Video" and see for yourself:
James Hardie Siding (i.e. Hardieplank) is the best exterior cladding material (outside of true masonry) on the market and delivers the strongest ROI (return on investment). It's imperative, however, that you only get a trained installer to put up this product as installation issues can cause future problems.
I agree with Philip. Visit the link below, select your region and you'll get a ton of ROI data:
http://www.remodeling.hw.net/cost-vs-value/2016/
Hope that helps and good luck!
Clifton Muckenfuss
Carolina Exteriors
Apex, NC