I got the same call from the same guy. Very threatening and wished me luck - the clue was that he said this call is for you instead of stating a name.....
Got a call today, hard to understand, had an accent, was a man, said he was from a Revenue Agency and the call was quite threatening. Told me to call him or have my Solictor call him and if I didn't call, well he wished me good luck. Said his name was Office Adam Shiffer.