I have been on the do not call list for years and yet I still get sales calls. Most aggressive telemarketers just ignore the list. I even get them at 8 in the am. When I mention that even if I were not on the list, they are required to call after 9am Im told that they can call as early as 8:30. When I bring to their attention that it is only a little after 8 am they just get snippety and hang up (only to call again after 9am).
If I attempt to complain at the do not call site, I get the scripted message that it takes many complaints to get an investigation started.
I will admit that the number of telemarketing calls are not what the used to be they seem to be growing in number recently.
The article seems to present a fair and balanced view of the industry issues.