What work is being billed for that isn’t done ? They quote you X you either agree to it or not. Another shop may quote you X too or Z it’s your choice to pay it or notBilling for work not done is pretty shady and why some auto repair shops get a bad rep. If the flat rate is 2 hours for the quick struts they installed but they bill for the regular strut service of 3 flat rate hours, they are ripping you off.
They are labor guides not the 10 commandments of what a place person or business will charge. It’s a guide.
shady is not doing something. Not telling you it’s 3 hours and you agreeing to it.