Telephone Etiquette

I have been prompted to write this post following what I assume is a sales call that I have just received. The conversation went something like this:

Me: 'Good afternoon, Convallis Software, how can I help you?'

Caller: 'Is that Convallis Software? Can I talk to the Managing Director?'

Me: 'This is Convallis Software, our Managing Director is unavailable at the moment, I am another Director of the company can I help?'

Caller: 'When will the Managing Director be available?'

Me: 'Can I ask what you are calling about please?'

Caller: 'It's' (then she says something I cannot here clearly)

Me: 'Could you repeat that please I couldn't hear you very well?'

Caller: puts the phone down on me!

I though how rude, although they were probably trying to sell us something we don't want it's not very polite to just put the phone down on someone you are calling, to me that is poor telephone etiquette.

I am sure we all have callers that we want to get rid of, but for a caller to put down the phone on me when I'm trying to find out what they were calling about has really irritated me. Have you had experience of this? If so did it bother you?

I know it's hard to be polite to callers especially when you are having a bad day, but when a caller is impolite it's not good, well if they call again and I see the number on call display I will be prepared for anything!