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The only thing that can cause a burner to go only to high is the infinite switch, the problem is you're saying all four of these do that, that's extremely rare unless they went that way one any time over a period of time or you had a power surge that welded the contacts in all four, or you have a melted wire between them somewhere that is grounding out all four switches so when you turn one on it sending power to the others when it's not supposed to, what kind of technicians would come out and say that was normal I have no idea, they obviously don't know what they're talking about, who did you call? Where they different technicians from different companies or where they from the same company? It sounds like you got taken if it was the same company that sent two different technicians out, was that the case?