This has been my experience, but I'm on an EPRP plan so I don't know if that makes any difference. I've always just stated "LTE debugging" as my reason and they've given it to me with no complaints. Keep calling back until you get someone who will do it for you.
There used to be a way on the N5 to grab it from logcat while opening the 3282 menu. I just tried it on my N6 and it doesn't seem to show up, unfortunately.