Unprofessional call centre agent

I need to change details and after holding for 10min the call was answered by a very unprofesional call centre agent. When trying to explain what i needed to be done i could hear how she took off her headphones and hear how she got up and walked away... the call obviously was not disconnected as i could hear people speaking in the back ground. We as customers do not enjoy having to call and wait forever before a call gets answered and then get treated like this. I'm taking my time and my airtime to phone in order to change details in order, as per agreement, payments can go off on time and not be delayed. So in return we expect you to do your job professionally and not waste our time. Please phone me back in order to het this sorted out.