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The switch on the bottom is a reset that's there if it doesn't run. It won't do anything to shut it off. Since the evolution series are primarily continuous feed disposals I suspect the problem lies with the switch you use to turn the unit on & off.
Ok, so you have a batch load disposal. Sounds like the top switch has failed. This is probably a warranty issue. I'd give ISE a call at 1-***-***-**** to discuss your warranty options.