Damaged KGuard Home Security

I purchased a CCTV combo set from groupon which was sold at 30% lower that retail but was still expensive. Even though pricey, I bought this thinking I am improving the security of my family and was willing to pay the full price. I then paid a technician a full day callout fee and he spent the day routing the cables through the house and mounting the cameras. Once he started setting up the DVR, he discovered it was faulty and one of the cameras was also faulty. (End of April) I followed up with customer service and my emails were ignored for 2 weeks. Started calling and threatening with social media, they logged a phone ticket with supplier. Over the next few weeks, Groupon has not called me to update me on developments and I've called every week to follow up with Pam with no success. It feels like I have wasted my money because the security of my home has not been improved but my bank balance has reduced. None is treating the matter with any sense of urgency. Why do I have to complain before I get what I've paid for.