I have had the miss fortune of dealing with there support desk once.
"My mobile data is not working"
"Have you tried rebooting the phone"
"Its not the phone because if I go into another town it works fine, I have been to the local 3 store & they are having the same issue"
"Have you tried rebooting your phone"
"Can you pass me on to some one who knows what they are talking about please as you clearly do not"
....... Think you can take an educated guess at what the next person said. Was not until I got a Level 3 (what ever one of them was) that I finally got some one who had a slight clue. It took them over a month to fix what ever the problem was. Apparently there was a faulty tower (Yes, I have a image of John Cleese in my head now) in our area. Once the contract is up in a few months I think its time to bin 3.