You were misinformed. I'm assuming you are connected to three "ultrapeers"? They only dictate how much of the network you are directly connected to (can search). The download depends entirely on the person/persons who actually possess that file you want. You can download connected to even one other node.
If the person you are directly downloading from has full upload slots or has gone off line, you will just have to wait.
Honestly, on Gnucleus, I have found that if you let the file sit in your download screen for a while, it usually completes.