Horrible service and lack of responsiveness to problems

These guys do the billing for rates at a building I just bought an apartment at. They have horrible service and some of their call centre agents are absolutely atrocious and aren't interested in helping you at all. My water and sanitation bill, as well as quite a few of the other owners/tenants at the building, was ridiculously high and unrealistic. I emailed them and called them in order to sort this out, to which I was told I would get a response within 48 hours. It has been days and still nothing from them at all. If you are a developer, do not go with this company because you will have countless complaints from owners and tenants at your development. They do not care about their customers