Transfer of account

I bought a house more than a year ago. All the necessary form were completed at the municipality and they confirmed that everything is in place. After about 3 months, they still billed the previous owner and not me. Every months when I went to pay the bill, I requested that they must correct that. Finally after almost 6 months I received a account in my name, but just to discover that they still bill the water on the previous owners name. I reported several times at the municipality itself and through their call center, but still not done. It is more than a year and they still can`t seem to sort out my account. I reported it several times at the Gonubie and Beacon Bay Municipality. I am really desperate to sort out this matter, but really don`t know what I must still do for them to fix my account. Surely it can`t be that complicated!!!