Titan tire group Sold bad dangerous tire Vancouver British Columbia

I bought second hand tires from them and find out the edge of tire were damaged and repaired wich is not repairable and standard and very dangerous. I returned and explained them clearly and showed them Profesional's advices and standards about not repairable edge and side of the tire and ask them to change the tires or refund them but they just tried to repair it again(!) and refuse to accept responsibility of their fault to sell unsafe bad tire and they put my safety and health in danger and it is a serious hazard I sent them text and warned them but they did not have any response and reply