"We urge the public to take note of our tips to spot these robo calls so they can tell us when they've received one,"
How? There seem to be a series of different reporting sites with different criteria, none of which seem to deal with attempted fraud. The site for reporting scam calls is only interested if the caller has been defrauded, otherwise it just redirects to a page of advice.
Marketi survey call reporting is, I believe, managed by the marketing industry and they seem to give themselves a free pass even for TPS registered lines.
ICO need to knock heads together and arrange a single portal, hand out the reports to the appropriate organisations and ensure that between them those organisations handle all situations.