I paid for parts that were not necessary

I brought my ford fiesta 1.6l in for a left tale light that was not working and my car tyres were making a terrible humming noise. After the work was done and they replaced the front bearings and ordered the back ones which they had no stock of so I would need to return.. got my car and my right tale light was not working and breaking light.. Brought the car in the next week they fixed that and put in the back wheel bearings.. my car is still making a terrible humming noise. They then said it was just the tryres making the noise.. 15000 rand later and there is still the problem of the noise? I am very angry