Overcharging on municipality accounts

We found out in June 2018 that we have been paying municipality bills for tenants upstairs for years. If you are with Trafalgar I would suggest you go through your municipality accounts as it seems that it has happened to other consumers on this thread as well. Although small amounts every month over the years this has become a lot of money and although we send multiple mails and phone calls Trafalgar has been dragging their feet for the past 4 months and find every excuse in the book why they can't refund us the money they have taken. We are commercial properties in Charmax building, Vredehoek, Cape Town