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I would have mentioned a long time ago that its more than likely if your are ripping tiles up to clean and stick back down your batch and shade numbers wont match. This is something I always stick with and it saves having to clean tiles. I also have learned face to face works best, sack your texting, phoning etc, caller ID is a ***** and people can just hang up on you once they know its you on witheld.
Take your money and run, or take control of the situation, you are the tiler, you know how it goes, I do the same with old walls, they need skimmed or they need pulled down and reboarded with the correct material. Its so much quicker and leads to a better finish.
GOOD LUCK !