Fixing very large cracks in asphalt driveway

[emmayer]

We have a 1/3 mi asphalt driveway. Overall, it's in decent shape, except for 10-15 really large cracks ranging from 1/4" wide to 4"+. We hired a company to fill these cracks and then the plan is to seal the entire driveway in the Spring.The company spent a lot of time blowing the cracks out so they're perfectly clean. Then they put in concrete (dry) and hot seal on top of it (my verbiage is probably off here). Some of the small cracks look pretty good. They came back and refilled some of the really large ones, but said that the tar-like material flows like lava and it's hard to get them full to the top.
To us, it seems that the cracks probably needed more concrete and then the hot seal on top of it. I attached one pic, I have TONS more. We got our invoice today, $2800....... my call will be going out first thing Monday to inquire that they can't possibly be done based on the dip still there with these cracks.
I am looking for opinions on how hard it is to fill cracks that large, and if our expectations are too high. Some of these cracks were 18' wide (width of the driveway) and roughly 2"-4" wide at parts (and 3-4" deep in some areas too). Thoughts???

[HayZee518]

cracks

evidently your ground is moving creating the cracks. this also depends on what the sub base is - compacted sand, gravel, large asphalt top coat and finish top coat.
with cracks as large as you describe, I would look into ripping up what's there and refinishing the whole thing.
if the base is poured concrete, is there rebar installed?
When you do the concrete, ask for a slump test. A two inch slump results in a 6000 lb concrete pad.