Sadly due to the way these things work it seems unlikely that there is much that can be done by “the authorities”, witness junk mail.
If you get post from a scammer you don’t HAVE to respond to it you can just throw it away.
However if you want the PO to stop delivering these kind of letters they might be able to if they can identify which letters come from the scammers.
And this proved possible where the scammers would use bulk posting and had distinctive packaging to their “mail” and so many scams were stopped.
But if the scammers use plain packaging or change their envelopes each time or even pass your address on to others then how will the PO recognise a scam letter from a genuine one other than by opening it, and we don’t want that do we?
So sadly the onus is on us, as the recipient, to identify that what has been sent to us is a scam and so throw it away.
Of course there may be a way to deal with telphone calls - as we are talking about technology here - but what generally happens when we ask “somebody to do something” is that in order to catch the scams we end up with it getting harder to get the genuine stuff and the scammers just come up with another way.
For example I once received a “number withheld” cold call and when it got abusive I asked if it could be blocked but was told that my provider (talktalk) could do it if I blocked ALL withheld numbers. But I want to receive some of these as many genuine organisations use them eg the NHS.
So what I did was got a phone that has Advanced Call blocker included - see this post here
Not saying companies shouldn’t try to prevent these things happening but we shouldn’t expect it to all be done for us we need to take some responsibility / actions of our own.