POOR SERVICE AND WORKMANSHIP

i spent R3900.00 and waited 2.5 days for them to sort out rear wheel bearings due to a humming noise coming from the rear.After collecting the car, the same noise is there and they insist that bearings were changed and the noise is something else. poor service from a very expensive workshop.i must now go pay someone else to sort out what i spent r4000.00 TO SOLVE.