Bad after sales service

I bought a Supreme Chef Whirlpool oven recently upon recommendation of the Hirsch’s salesman after having explained that I’m an avid baker and have enjoyed my previous model the Jet chef immensely. What he didn’t tell me was that the new model has an open element unlike the previous one which burns all baking before it even gets to rise! The oven is generally not user friendly and after a few attempts I contacted Hirsch’s. Chrissie pushed me to Nonpumelelo who insisted on sending a technician. He agreed with me and said he has other customers who bake who share my views. After a while I asked Nonpumelelo via email what is happening and she didn’t even bother to respond. I have purchased various items at Hirsch’s and have a loyalty card. It seems they are less loyal than I am