Unable to deliver

In early August 2015 I purchased a DSTV Explorer from Makro. The sales consultant convinced me to purchase an installation voucher from Blingstallation. I acceded to her sales pitch given Blingstallation's affiliation to Makro. I assumed that they would provide superior service given this relationship. The voucher cost me c.R1,600. Within a week Blingstallation came through and installed the decoder and new satellite dish. During the installation, my husband asked them to assist with other connections. They charged him an additional whooping R8,000 over and above the initial R1,600 I'd paid to Makro. Unfortunately they failed to connect our televisions in accordance with the script from my husband. I've called them on numerous occasions and spoken to many call centre consultants. They promise to come back for a repeat service but always cancel as the installer runs late. I've also asked for invoices re the work performed to no avail. Whilst they guarantee their work for 12 months, I've yet to experience their delivery. We've delivered on our part and paid the amounts quoted. However, they've failed to provide a service. Have we been duped?