I stayed in an apartment on the weekend equipped with a Beko RDNE530K30W fridge. It ran with an extremely annoying high pitched whine that my companions and I found very difficult to tune out (or cover up).
I've been contemplating a new fridge at home and learned two things: a) Don't buy this one b) Ask to hear the fridge in the store before buying. Even with store background noise this one's high pitched whine would have been immediately obvious.
Have you tried to contact Beko or the seller for warranty as this can be a warranty issue?
Btw, how old is it?