Southdown Market in Northport

So, we have been to Southdown Market in Northport three times in the last two weeks.  Every time we have shopped there and are checking out, items are ringing up much higher then what the signs say....example:  Blueberries $2.99, they rang up at $5.99.  Apples .79 a pound, rang up at .99.  When you question the price, their answer is, "that was last week's sale" and don't honor the price.  Yesterday, when I went to buy apples and complained they rang up the wrong price from what was listed, the girl went to check and surprisingly the sign disappeared.  This is not good business.  This needs to be addressed and fixed.  Bad Business!