Redcrx: When we first started having problems I too joined the TPS. However, I was warned that their boundaries were only as far as our borders. They had no control over international callers, which made sense, of course.
These companies sell on the details to other companies, especially in the area of mobile phones, insurance, time-share, and most exasperatingly lottery-fraud.
http://bigworldsmallboat.blogspot.com/search?q =we%27ve+just+won+the+lottery
There's a link at the bottom to the Metropolitan Police Fraud unit, but that would apply only if you start receiving lottery-type calls from abroad. And right now, if it's only a trickle, rest assured, it will grow.
I wish you well
Fr Bill