Shocking Bosch Stove Experience

We bought a touch screen stove from Makro and one of the plates broke before a year anniversary. We went to Makro and they called in an outsourced company to inspect. Our Bosch ref was BJ181890. Thoms Appliances and repairs came out and told us an ant had possibly died on the plate and caused the blow of the plate. How is that our fault. I sent an email to the owner thomassiwela and no response. Bosch uses inexperienced people to do their work. Will never by a Bosch appliance ever again. Our warranty was still in force but it was useless.