Chalk it up to a life lesson. You told someone to help themselves, and they did just that.
I know you didn't mean "all-they-want", but it's just firewood to somebody who doesn't spend the time and effort to make their own woodpile. In their mind it didn't cost you anything... and I'm sure they believe you can "easily" get more, if and when you want it.
I learned that "life lesson" many years a go, sort'a along the lines of, "give a man a fish, teach a man to fish." I flat refuse to help someone who won't help themselves... if they won't help themselves they won't appreciate it anyway, and are likely to take advantage of you.
One of the neighbors stopped this fall while I was outside covering windows with plastic (the wife of a couple... city folk transplants), she asked if they could have some of my firewood to use in their fireplace, especially over the holidays. (Now understand, clearly visible from the road, I had near 15-cord neatly stacked and a good size pile of odds & ends. I also knew what the next question would be... they ain't got anything resembling a truck, she would have to ask me to haul it over to their place.)
So I climb down off the ladder, look straight at her and say, "No... I won't give you any of my cut firewood. But if'n you, and/or your husband, wanna' come over tomorrow morning to help, we'll go out in the woodlot and cut and split ya' a nice load of firewood... then I'll haul it down ta' your place and help ya' stack it." (Now listen, I know neither one of them would be much help... but that ain't the point, is it?)
Well, you should have seen the look on her face... she turns, points and says, "But... ... ... you have so much?"
"Yes ma'am... ... ... see ya' in the morning." And I stepped back up on the ladder.
Neither one of them showed the next morning... but I did see him carrying in a couple of those wrapped bundles from the convenience store by the campground one day.