Cats are usually super sneaky, so a lot of them come to a call that are never seen by the caller. They are also stupid about calls. A coyote learns to avoid calls but cats will come back again, likely several times. Somebody on this forum told of repeatedly calling a radio collared cougar and it never failed to come to a call (though the callers never saw it!) I called the same bobcat twice in one day.
My impression is that bobcats stick to a smallish area except when males are on the move durng the mating season, and sometimes I have gone back and found apparently the same cat.
Not really advice from here but if twere me, I'd quit calling for at least a week or more and meanwhile try to find out if the bobcat is still in the area. If you don't have a trail camera, raking a lengthy patch of every trail you know of around and in his area might get him to show some tracks. Scratch it up just barely enough to make a tracking soil.
