Stu you just end up having weird conversations, but ultimately you have to do that to get where you want to be.
I get fobbed off all the time with receptionists, but I have my own way off getting around it. I ask in a very polite voice " so is it yourself that makes the decision" they completely back down, but I do it in a nice way, come across as a bit confused.
I put it across like Im a bit knaive, they dont like to be challenged.
Had a call today, oh no the owner wont like that - I just said, I will call back if hes not about, no worries, i just need to speak to him.. If I get asked by the receptionist to send a mail in, I then say, well I really need to establish if oiur business can be of any use, before I send an email, Lots of ways around things.