Hi Beatrix,
We also have a Belling fridge/freezer and it's pretty loud too - it sometimes sounds like its groaning! We didn't bring ours back because we put it on a stand and thought maybe it wasn't exactly level and that's what was causing it. It was much worse when we first got it but it has quietened down over the last few months. Let us know if you do bring it back as I would be interested to hear the outcome..
Thanks.