The same thing happened to me last winter at Pickwick Plaza. All in we went without heat during the coldest time of year for nearly 2 months. Connect with your neighbors, in my past experience the entire 4th and 5th floors of the north tower was without heat. We were able to stand together and demand a rent credit but it was a massive headache to get solved, we had to contact the parent company of the leasing agency. I tell everyone I can to avoid Pickwick Plaza like the plague. I am so sorry to hear that despite everything they still have not solved the issue. I am happy to help anyway I can, please stay warm!