What does the Xbox support customer code 720 mean?

""720 alright 720 he was not savable and he was a bit argumentative alright 720 720" O_o dude forgot to hang up when talking to me about stopping auto renewable. I mean of course I am argumentative guy kept trying to sell me netflix, 3month sub and stuff when I told originally my reason was I am a college student I don't have the time now. O.o