Samsung With no Solution

I bought a Samsung Stove -Model BF1N4T013 which was replaced in September 2017 with Model PKG500. Immediately I noted that there oven does not switch off it continues to run even after 30 minutes. I was told by the service provider it’s cooling. Which was very strange as the light would be on regardless. In February 2018, there was an explosion while cooking and electricity tripped. I logged another call, I was advised that it’s ****roaches making the stove strip. To date the stove still not working. I sent an email to Rama’s and they forwarded the email to Samsung Service Provider. What more must a person do. I am told that the stove is not under warranty as the warranty on my old stove has expired. From the day you installed the stove it had problems and now it’s not under warranty. I had bought a Samsung thinking it was a credible brand with credible service provider. I am really disappointed