Sinoni accommodation from NZ$470

This company is completely untrustworthy. We had one night reserved here and two night at another of their properties. We wanted to stay at this property for an extra night, and cancel the first night at the other property. Everyone told me this would be fine - the staff at this hotel, the staff at the second hotel, and their main office staff. They said to book the second night at this place and then send a request through to cancel the first night at the other property and they would accept it. So I did that. But they rejected my request. They blamed the computer systems, claiming to have accepted. The property manager at the other hotel assured me that the company would sort it out with the travel agency. He even told me he had a notation in the file about the size of the refund. I followed up to get the refund for the first night at the other property and now the main office is saying we stayed there for the full two nights which is completely false. Needless to say, I have enough documentation to challenge this through my credit card, but I shouldn't have to. Long story short, don't do business with this company - they will lie to you and everyone else just to squeeze some extra money out of you.