Pathetic service

I purchased a Russel Hobbs oven,hob and extractor on 21/07/2015 cash. Brendin the salesman told me I had to use installers contracted with them to be entitled to my guarantee for a fee of R499 and will be issued with an electrical certificate. I payed this. The item was delivered on 29/07/2015 to my house in a sealed box. On 28/08/2015 my kitchen was completed and I phoned the installers,they came on 29/08/2015. It was then found that 2 plates were not working and reported it to Game (Vani) The store manager phoned me and said the suppliers technician will be at my house on 31/08/2015. No one came and after many phone calls and a visit to Game personally,finally on 3/09/2015 someone came. The switches were not working. I refused this appliance and had to choose another unit as there's no stock anywhere. I now have a Whirlpool fitted,but upon requesting for an electrical certificate,I am told by Vani that only on Gas installations can a certificate be issued,not on an electrical stove. In that case I could have installed it myself and saved R499. The service from Game was pathetic and I will never ever want to deal with them again