Lets see, if the wolves are eating all the elk, then to call wolves, you need to sound like dinner. I'll bet elk cow calls would work.

Wolves are supposed to be aggresively territorial, so male wolf calls---no not whistles, you pervert

--Male wolf howls also coyote yelpers should work.

I would also think, I would not want to be calling alone for these critters. Hunt with a partner.