Tile & Grout Restoration

We hired Ash to come out and re-do our silicone. Greg suggested that we use epoxy instead of silicone since it does not become moldy as quickly as silicone. The color of the epoxy, however, did not match our tiles (see picture where you can clearly see that the epoxy they used is not white like it is supposed to be). I mentioned this to Ash and he assured me that this was the whitest he could find in the store (why begin a job if you know the color is off?). I literally even called around and found the correct color myself at a nearly hardware store, but he kept telling me that the epoxy he had was true white. Also, he suggested that where the wall tiles meet the floor we should use translucent silicone (instead of clear which we previously had) but this was an awful suggestion since our shower door and floor are both black. I contacted Greg with pictures and he basically responded saying that "who is going to pay for Ash's time if he needs to redo all of the work?" The fact that a company wouldn't come back and fix a job that wasn't done right and doesn't stand by their work is incredibly disappointing.