I was pestered by telemarketing calls until out last move. I had to get a new number and had it unlisted and I bought Privacy Direct which blocks calls that have ID disabled or “Unavailable.” The caller has to give a brief message identifying them and the reason for the call. When I pickup I can chose to receive the call & allow the number to ring through next time or block it forever. In two years, we had just a few sales calls; most of them hang up when they get the Privacy Direct service and the Privacy Direct number shows up on caller ID.
IMHO, all telemarketers, junk fax senders, spammers and child molesters should be dropped in dry oil wells.
As for the loopholes in the Don Call list or anything else; remember there is really only one political party in a long-term democracy, the $Green$ party. They are not conservative or liberal, but they rule.