Bad customer service

I called in Jan looking for a amount to pay on my account and advised the agent that i would pay at a later stage ,and asked if the payment would change ,the agent said the amount will not change at all ,i called in again on the 1st of March to get the banking details on where to pay ,and the agent advised me of a different amount ,i requested to speak to a supervisor and spoke the a guy by the name of Bheki who promised to listen to the calls and get back to me by monday the 2nd of March with feedback ,but that never happened ..I even advised Bheki that if i am at fault and never understood the agent that i would glady pay what is due.