Bad after sale service for this company

I bought my car August 2023, in August 2024 ABS warning light came on, took the car to Kelston Motors for this to be looked at, and apparently the right-hand wheel speed sensor has open circuit, no damage to the vehicle to suggest that the car was badly handled by me, it is just a loose cable, not damaged not broken, but I had to pay R477.25 to put back the cable. Why does the car come with warranty if I have to pay for factory faults? I thought I love the car but after this not anymore.