Bad attitude, dont know how to speak to client

I write this communique very aggrieved about the Lady called Felicia Chetty who phoned me on 16/07/2015 about the upgrade of my contract. Even though I was saying to her that am not happy with the product I don't want it she kept on pushing. She is disrespectful and I was amazed if this is the service which customer of MTN experience on her service. She told me how I don't know what I want. in the first place she is the one who called me and selling product to me. I think Felicia Chetty must be trained on how to communicate with client, if she is frustrated about her job as a Call Centre Agent you better do something I believe am not the first person she tries to force to take the product which client don't want. By calling me is not a favour as am the one who pays