Installation not done 4.5 months later

We have bought a Explorer 2 with installation on 1 May 2017. We were told to get an accredted installer. We have been unsuccessfull as none of the installers were prepared to go out. Meanwhile we were at the N1 City branch where we were insured an installer will come out. We have phoned several times. Last call was 29 Aug 2017, ref ********** 0-I79. Palesa insured me that we will have an installation by the end of that week. It has been 2 weeks since and once again no installer contacted us.