"We all do that" from a professional is a big tip off that serious corners are being cut by people managing this program. I retired from the social services trenches. So I know a CYA line when I hear one! I would bet dollars to donuts that that families case file and the visits by the MT have not been properly documented in a case file since the initial application for services was made. If she "was working with him for 3 weeks and didn't know anything about him" it means she had no case record notes on the child to clue her in on the needs of the child or the goals set for the family. Oh and you can bet that the 15 minutes she spent on the phone with you was being billed as a full hour to the county and the insurance company that was paying for her time. In short the MT was an unethical cheat.
If they beg you to come back. Ask what happened to Brandon's predecessor? I would strongly guess he or she was either about to be terminated for mismanagement or was promoted because they were not suited to manage this program.
Bren, don't compromise your ethics for a job that is run by uncaring bureaucrats. I am proud that you quit.