Call centre agents

Absolutely furious!! They never take no for an answer!! Every other day they got your number from someone else. And when you say you are not interested, the Consultant says in a attitude voice that you haven't listened to what she has to say. How many times should a client listen to the same story??!!! And then she has the cheek to say they haven't phoned you before!! Nr 1 rule in sales. Listen to you clients needs! To go on talking after a client has told you to stop, will definitely not make the client buy from you! No in fact it makes a person angry to a point where they will report you!!