I see a few problems to be solved then. So we need to firstly know the code phrase in order to figure out how to split it up into things we can trick the tech into saying. Then we need to find out how to get access to the techs in the first place.
If you were going to be uber-l33t about it all you'd have to do is hook up a line recorder to a payphone, then call the phone company and bitch about it, then wait til the tech shows up and recover the recording device.