You could've said "bye" first.

So Mondo is sub-contracted by a big cellphone network provider.... They just called me to offer me a data package and the consultant clearly did not like my answer because she put the phone down in my ear while I was still explaining why I don't want their contract. This is not the first or second time this has happened. This happens 90% of the time that they call me. And quite frankly, I am sick and tired of the rudeness now. Please teach your staff telephone etiquette during their training. I understand that I am probably demotivating them by saying "no thank you" but that's no excuse to be rude.