Monro Muffler Brake

I came in to the car repair shop so i can get my car fix. The manager told me that he will take a look at my car and too give him 15 mins, so i did. He came back and told me that my car needed a break flush and that was all and my car will be working fine. Then he told me my ABS SYSTEM had locked up and he'll unlock it n release the AIR... SOON AS I LEFT MY CAR STARTED DOING THE SAME THING, IT WAS DOIN B4.... I took it some where else TO HAVE IT LOOKED AT AND IT WAS TOTTALLYYY SOMTHING ELSE WRONG WITH IT!!!!!! UGH!!!!!!! AND HE CHARED ME $100