Extremely rude call centre agent

I have just had the rudest call from a call centre agent, Tasha. She called me to recommend additional data as she seems to think I am purchasing extra data on a monthly basis at an inflated price. I told her I was unaware of this, and she started getting a little rude. I then asked her to send me proof of this and she put the phone down!! I have never experienced such rudeness! I have never been rude on any call, to any call centre agent. She could have just said ok thank you, goodbye. Don't just put the phone down! I expect better service. Please deal with this accordingly!<br>