[colgin]

Villain's turn donkbet doesn't seem too scary here. However, it seems given your description that he is going to follow through with a river bet no matter what comes. Thus, I would be more inclined to smoothcall the turn and pop any non-Ace river. I think a turn raise may make him fold truly hopeless hands that he might otherwise take one more stab with. Plus, you might get a crying river call from Ax that would otherwise either fold to the turn raise or call and then check-fold the river unimproved.

Given your line, which I think is fine too, I just cal down after the three-bet as you did.