Tire Marking problems of the 2001 Chevrolet Blazer

The contact owns a 2001 Chevrolet Blazer. The vehicle has fate range runner ht tires, size 235/75r15 (na). The contact discovered that the dot number had been mechanically removed from all four tires when he had them rotated and balanced. He intends to call the dealer and the manufacturer as soon as possible. The current mileage was 101,886 and failure mileage was 101,851.