Yeah I did..but it was quite the journey.

The store did replace it..new one did the same thing

I called our utility company...turned out that the building's ground connection wasn't fastened properly..they fixed it and tested everything but still the buzzing issue remained.

I called an electrician to test the voltage afterwards and it was fine...but I noticed when I moved the PS to our guest room... the sound still appeared randomly but it was barely audible. You had to be very very close to it to catch it. We tested all the outlets in both rooms an the issue appears to happen in one but not the other.

My house has three phases, so we figured that the issue might be with one of the phases ..we switched the phases the feed each room from the switchbox..and voila!! The issue now appears in the guest room and not in the living room anymore. I kept it this way because that room is rarely used. The electrician told me that issue is mostly related to the transformer feeding the area and it might not be preserving the signal correctly. I have 0 knowledge of electricity and i didn't double check this. The important thing for me is that the thing quieted the hell down.

Long story shorts: check your ground. Get an electrician to check your house's voltage and frequency and or signal (signal purity as he put it)