Gets rude if you do not want to accept what they want to offer you

I am so upset and angry about a call I just got from your marketing department. Never in my life have I received such horrific and unprofessional call from Telkom. After I did not want to take the "special thank you" upgrade, the lady kept on going about how good the contract is and its all about the benefits. I kept on saying that I am not interested, and she went from being super friendly to being super rude.

As a customer, it is my choice as to what I want to accept and what not. And if you cannot keep being friendly and professional when a customer says NO, you do not belong in a customer service area. If this ever happens again, I WILL BE CANCELLING ALL MY TELKOM CONTRACTS! I will not be treated like that because I choose to say no!