Glen — glass cooktop glen gt 1049

I purchased a glass cooktop on nov 7, 2016, on november 3rd when my wife was cooking dinner the glass of this cooktop shattered with a blast spilling the food all over. The pieces of this shattered glass came to almost 10 feet. Fortunately my wife did not get major injuries, but one of the glass piece hurted her right hand. When the technician visited and inspected the matter he mentioned that the fault started from the periphery of the burner. Later i received a call from the services center saying the glass can be replaced only on a chargeable basis. The technician also confirmed that it looks like a design fault for this piece but after sales support says that we don't care you have to pay for the glass. I am not sure what is the guarantee that even after getting a new glass on this stove if it will work because the actual fault is not being treated. It has been almost a month now we are struggling please let me know how are you planning to resolve this.