Very simplistically put, the telephone wire from your home has to terminate at a device that will 'massage' the stuff coming from/going to your home, into a form suitable for transmission over the public carrier network. This device is an electronic box of tricks with a varying number of sockets, into which your telephone line is ultimately plugged. The 'box' is usually mounted on a rack, and the sockets are known as 'ports'. So... they need to get more 'boxes' installed in their rack cabinets, so they can have more 'ports' available, including one that they could use for you.
The remote possibility does exist of a cancellation, which means your line will be plugged into the port that becomes available. However, there's a greater likelihood that you'll have to wait for more 'boxes' (otherwise known as Digital Subscriber Access Modules - or 'DSLAM') to be bought. This usually takes a while, and you'll get excuses like 'it takes 6 to 8 weeks for them to arrive from overseas' or 'the stuff has arrived, but is still being cleared by customs', or words to that effect. The best thing to do is to phone every second day, and worry the hell out of them. Personally, I had to wait 2 months for my service to be transferred from one area to another. Trust this throws more light on the sibject and assists in some way...