Billing Dates changed unilaterally

I really find it difficult to understand or comprehend what the City Of Jo'burg is doing by continously and unilaterally changing billing dates. I get the sense that someone is out to make an extra buck because they know that people will not be able to pay their accounts at some point due to the erratic nature of these billing dates and then will start charging penalty fees. This practice is UNFAIR & *********. Who can we direct our complaints/queries to seeing that even their Call Centre is not able to handle our queries.....