Lack of Information/ Poor Customer Service

I purchased an airconditioner and an installation voucher from Dion wired and 4 days later I contacted the installation company because I had not received a call to arrange installation yet. They informed me that Dion wired did not even send the information to them. Dion wired also failed to mention that I would have to pay an additional amount of nearly R2000 ontop of the already expensive installation of R2000. I would not have purchased this voucher had I known about this amount because I did not budget to spend more for the installation. One would expect better customer service and to be properly informed when spending so much money at a store. I am so disappointed in Dion Wired.