After taking my car in for repairs, the brakes still squeaked, and the window winders don't properly work despite Denever working on it

After taking my car in for repairs, the brakes still squeaked, and the window winders don't properly work despite Denever working on it. When I brought it to his attention, he was always too busy to rectify it. Furthermore, my cars carburetor is damaged after taking it in, and the mechanic **** about being RMI accredited.