Leprechaun lawns

I've had 3 herbicide and fertilizer treatments and I still have almost as many weeds as when they started and I've seen them spray weeds but nothing happens so their chemical is ineffective or diluted too much. The last time they laid down fertilizer there was only 2 or 3 granules per square foot which is useless. They promise unlimited reapplications which is a joke since they do not respond to emails or phone calls.