I have great lengths & have not had this problem except when i forget to brush my hair or put it into a low pony or braid . . . .
sounds like you r salon uses lower quality hair - i have used evrything & think Great Lengths are worth the $$
if you are taking care of them, putting them up before sleeping, brushing gently & using proper shampoo/conditioner (no silicones!) you shouldnt have any problems with matting unless it is synthetic or cheap hair
www.greatlengths.net will show you the difference between extensions types of hair