PARTS MISSING

I was told to buy about 5 different sensors for the car according to the diagnostic code the car had, I did just that in May 2019. when i went to pick up the car I was told that the warning lights could not clear even thou they have installed new part due to faulty BCM, by the way the car performance worsened. I bought BCM January 2020 and went to the electrician that specialised on Chevrolet in Pretoria and they Install my BCM and he explained that the light cannot be reset I need to get SAME SENSORS THAT DNJ AUTO ELECTRICIAN REPLACED. and I was there they took out all the old sensors in front of me and replaced just one for RIGHT WHEEL SPEED SENSOR AND THE ABS CODE DISAPPEAR. NOW I AM ASKING MYSELF WHAT HAPPENED TO MY SENSORS THAT I GAVE TO DNJ TO REPLACE BECAUSE CLEARLY THEY WERE NOT REPLACE I PAID A LOT OF MONEY FOR THESE SENSORS AND PAID FOR THEIR SERVICE AS WELL.