What should I do about my stove?

My fiance and I are renting a small little duplex for just me and him. The stove we have is a Hotpoint model. And it's very very old. When we moved in the Temp knob on it was in two pieces. a metal piece that has the temp and the plastic knob part. Since then, it has shocked me several times while cooking. We put in a work order, the guy came out, said he couldn't find out why it was shocking me and said he couldn't do anything about the knob. Now, after trying to fix the knob myself, and looking for a replacement knob, everyone i have spoken to can't find a part. What has to happen before the landlord will replace the stove??? (i'm talkin like late 70's to 80's model stove.)