Deadmans door

I took up multichoice offer with an explora and hd decoder with installation. Onair Tv sent us details of an installer with whom we scheduled an installation. The installer was cheeky and I chased him away before work was done. We then went and looked for another installer on the website and saw that TV + Video doctor was listed so we had them do the installation. Upon finishing we were advised that they do not accept onair tv vouchers because onair tv takes too long to pay. They advised me to pay them and submit my invoice to onair tv for payment, which I did. I received an email back after a few days stating the following: "Please be advised that we require your company banking details on the invoice and the invoice needs to be addressed to Comit Technologies T/A OnAir TV". Now obviously thats not going to happen. I am not an installer. I am claiming as an individual with an invoice from the installer. If I phone they say I must email. On the email nothing happens. So I need to know how am I going to get my money back? I am utterly disgusted with the service. It's been weeks already.