IPL Hair Removal on Face Does Not Work?

Hello, I've been doing IPL hair removal on my face and legs for a year now. While my legs have responded well, my face has not. The hairs were very thin to start with and are now thick and very dark. Almost like a man's beard. The hair also never seems to fall out after treatment. The beauty salon says it will take time but it's been a year and is only getting worse. Is there any point continuing with treatment? Also, I've heard you should never wax or pluck between treatments, is ths true? Thnx