Rudeness from call center agent

On April 11th at 16:51 I received a call from Vodacom's call center to promote a data package that's supposed to be cheaper than what I am using now. The lady checked my profile, and gave me the details. The conversation lasted 3 min 37 sec. I was courteous throughout the whole conversation. I gave her time to speak, asked what I wanted to know. And when I told her that I really can't afford to pay more at this stage, and that I am not interested she put the phone down without as much as a "thank you for your time" or "good bye". I find that very rude and unprofessional.