RUDE CALL CENTRE AGENTS!!!!

This morning I received a call from MTN mobile, asking to speak to a specific person. I informed the call centre agent that he`s got the wrong number. He just put the phone down in my ear. A few hours later I get a call again, asking for the same person. I informed the lady that it was indeed the wrong number and that I had received a call earlier from them and informed them accordingly. I requested that my number be removed from their system. She then started talking to me in another language (that I didn`t understand). You could tell by her tone that she was being rude!! This is so unprofessional!!! MTN really need to look at who they are hiring in their call centres!! I am NOT an MTN user, and this lack of decency will ensure that I NEVER become an MTN client!!!