Help: Orange BlackBerry question

Got this in from a reader today. Can you help?

I have a Blackberry through Orange on a personal contract. My employer has set up a Blackberry Enterprise Server and given me instructions how to connect by activating the Blackberry Enterprise Service on my phone (just my email and a password).

This did not work so I asked my employer and they said I needed the service activating which will cost me around £15 / month.

I phoned Orange and they said I need a business account with over 10 phones for that.

I get the feeling I am asking for one thing and they think I mean another. Any advice?