Hi, I'm in Pittsburgh, PA and I have a slight problem. The heat in my apartment does not work, and never has. I left my landlord a message about it on Saturday 2/19 at 630pm. I called him again on Sunday 2/20 at 2pm, at which point he told me that he would come by later in the afternoon after his son's birthday party and would call me when he was coming out. He never called, and did not answer his phone when I called him again. Is this legal? How long does a landlord have to fix this?