I had those tossers phoning me up every day for the past three days. I don't answer the phone to numbers I don't know so I googled the number and found it to be these compensation nuisances.
Funny story btw.
I have just bought a BT 6500 Dect phone for £29.16 that blocks withheld and International no number calls.
Will see how it goes.
Mick.