Home Depot Did thousands of damage to my condo Fort Myers Nationwide

I hired Home Depot and pre-paid them over $8000 to install tile throughout my condo.  I am doing a complete renovation.  My order called for Sanibel white tile with Alabster grout and 5.25 inch baseboard throughout the home.

The materials for the installation arrived a few days before work was to commence.  I checked the materials and they were all correct including buckets of pre-mixed alabaster grout.  I met the installation company that they hired, USIG, at the site the day the installation was to take place.  I confirmed the details of the order and the installation with a manager who was present.  The installer told the manager that he did not like the grout that was pre-mixed because it was not easy to work with and dries too fast.  The manager asked me if he could switch out the grout and i told him that he could as long as he made sure it was alabaster.  I told him this because at one point the installation team at USIG changed the order to Grey and i had to call and get that corrected.  That is why i was so diligent about checking on the grout.  

Since the toilets all had to be removed and there was much construction dust, my family headed to Sarasota for 4 days.  When I got a call that the baseboard was going to be going in the next day i made plans to travel back to Fort Myers to inspect the work on Friday of the following week (7 days later) 

On Thursday, the day before I planned to return i gave the Lockbox code to another contractor who was going to work on a shower installation.  He called me at 4:00 on Thursday and told me that my condo was flooded.  I went down and started trying to dry the place out.  That is when i saw that they had installed Gray Grout instead of Alabaster.  They had also splashed mortar all over the wall on the lanai and in other places.  Coincidentally that mortar matched the splashes in the kitchen where they had turned on the water and used a sink they were not supposed to use. 

While cleaning up, they went under the sink and turned the water on at the shut off. they were careful not to let water go down the drain because they saw that the trap was not connected to a drain.  But they never turned off the water under the sink at the shut off.  The faucet had not had a complete hook up and dripped for 2 days, ruining my cabinets and flooding the drywall in two rooms.  

Home Depot immediatley stopped talking to me and referred me to their in-house claims department (different name, but housed under thier corporate office location).  

AFter a careful investigation (performed by the installation company - Does that seem fair?) the claim was denied.  They said that the damage was caused by my other contractor who did not even have access to the property during the days of thier installation.  They also said that the grey grout is what i selected even though i sent them the original order with alabaster on it.  They claim department stood behind USIG, the installation company and i am going to be in financial ruin over this.  

What can I do?