"spraying the weeds every time." Does that mean spot spraying? There is a good chance that the fertilizer is far above what you want--as a mowing contractor. The invoice should show what product was used--and--how much.
The residents of the complex should be able to tell you what the rue green guys are doing. Most companies would be happy to drop the fert and add more weed killer. (Or another ap of weed control instead of fert.)
What was the crabgrass situation?
When I worked for rue green, sometimes the salesman would under measure the property and sell it for cheap. Then the applicator is doing the job billed at $200, when it was really a $400 job, that took 3 hours, and therefore have trouble making his $1000 per day quota.
Tru Green guarantees their work--ask for a service call or redo.