I would start by approaching the manager of the apartment complex, since it should be there responsibility to fix it, and I imagine others there are having the same problem. Or, is this coincidental? I constantly have to reset the wireless router almost every other day due to the lost connection. This is the same kind of plug that you use to plug your telephone into the wall. What coloured pair of wires would usually be used to put a single phone outlet on? The fact is that small wiring jobs in your house or small business can be much easier than you'd expect, much easier than shelling out exorbitant hourly fees to the phone company.
One line goes to my modem and router with the other line going to my home phone.
Replacing a Phone Jack
Adding a Phone Extension. Had a telephone tester. Attaching color coded phone lines to telephone jack. The most common type is the 4-strand 2 twisted pair. If the there are 4 wires black,white,red,blue in an older style single floor unit complex in Queensland.