Tire Tread/belt problems of the 2007 Chevrolet Cobalt

The contact owns a 2007 Chevrolet Cobalt. The contact stated that the vehicle would pull to the left. The dealer stated the vehicle needed a front end alignment. They performed the alignment however, the failure continued occur. The dealer stated that the tires could have caused the failure. They recommended that she replace all four tires. The tires are continental touring contact as (mts p195-60-r16 dot number cpv9blc1306). The failure mileage was 30,000 and current mileage was 31,000.