Harmonic sound when making slow turns (like into a parking spot)

Every since I had my front bearings and brake pads replaced I have had an harmonic like sound when turn at a slow speed. At first it was only occasionally but now it does it almost every time I turn, mostly right but lately left too. I returned it to the shop right away. They first said they fixed the problem but immediately I heard it again. I have returned my car to the 5 times and they still don't know what the problem is. I feel that it is related to their work and want them to fix it. Just can't find anything regarding the type of noise I am experiencing. This is the only car I have and I am a working single grandmother raising three grandchildren. It is a burden to not have my car every Saturday for the last 5 weeks. I just need some idea of what the problem could be so I can be more proactive in the repair. Thank you for your time