No sympathy- not accommodating - terrible attitude

A lady from the Call Center phoned me about my arrears account, which I obviously know about. She asked me about my payment and I said that I could not make the entire payment this month so I only paid what I could afford. Immediately her attitude towards me, the customer, was bad, she started accusing me of never paying etc. Which is not true, so I said to her that she was blatantly not telling the truth, to which her answer to me was that she wasn't going to talk to me anymore because I need to show her respect? I am the customer. In my opinion I wasn't being disrespectful, her attitude towards me was appalling from the start, she didn't want to listen, she didn't want to hear what I was saying. I work with customers all day and I have never treated any customer in that manner. I got angry with her and told her that I was going to phone her manager, she laughed at me and put the phone down. I am the customer, I am the person asking your help and you are not willing to help me? All I want is a civilized conversation, in which I get a chance to speak and be heard. After all I am the word of mouth....