Sharon in

I purchased Lifemaster paint (Pacific Mist) for my living room, foyer, hall and bedroom. It was to cover a light green; the manager of the store said yes it would cover in two coats as did the professional painter I hired. After two coats, the green was still showing through, so I purchased another gallon and had the painter apply a third coat...STILL the green shows through. I am very disappointed and am wondering what my next step (and $$) is to get rid of the green. I checked on another bedroom I had painted with Dulux paint a year ago in a natural wicker colour and the green shows through there also. What is it with this paint that it doesn't cover??