This sounds like the've priced this out like a full oil change. Presumably under the idiot model of we can't estimate how much to drain, so we'll have to drain it all and fill with proper quantity.
I'd climb under and drain 1/2 qt or so out myself, and this time give it some time to settle out and take an accurate reading as described elsewhere. Running around 1/2 qt low is a non-event, and not worth the effort to squeeze in that last 8 oz. w/o a dipstick.
Objects in mirror are slower than they appear.