Failure to monitor cameras

We installed cameras at a business complex for Seek to monitor. About 6 months later, we had an incident. I had to inform Seek about the incident, turns out nobody was monitoring the camera, they did not realise the power had been cut somewhere in the past. I spent about 2 weeks trying to organise a meeting and to get facts from them. The feedback was very dissapointing, they refuse to take any responsibility or offer me a refund on the expensive cameras that were installed, but probably never monitored. They promised to do an investigation, but I never heard from them again. They only kept sending me invoices to pay for the service (that they don't deliver).