Reject as not fit for purpose under the sale of goods act. A few pence on components probably stripped out of the original design to cut costs would cure it. Lack of screening (ali foil would do it.) or pin 1 problem (google it).
Does a mobile phone make it rattle?
It is not difficult to make equipment that is not susceptible to a few milliwatts of RF. If the broadcasters had the same problem it would be even more noticable, Tens of kilowatts of RF and milliwatts of audio can be kept separated enough to satisfy HI-FI buffs.