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It sounds like your thermostat sensor is whacked .... if your landlord won't replace/repair it you may need to develop a wall chart to convert thermostat readings to actual room temps.
The thermostat sensor is probably measuring air temps right next to it - and couldn't care less what the actual room temps are away from it. If cool air pools by the thermostat, it doesn't know to turn the unit on. That's why I recommend the oscillating fans - not only do they more evenly distribute the cool air within the rooms, but they also prevent cold air from stagnating by the thermostat, which makes the unit think the entire room is cold.
Also, check your rooms for heat sources that are warming the air away from the wall unit -- window air leaks, incandescent bulbs, appliances (PC fans throw out lots of hot air into a room), etc.
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