Since then, I only get such calls from companies that got my details in exchange for some freebie. I tell them I'm not interested, and would they please stop calling me, and they do.
The only calls I got recently were in English with a heavy Indian accent, "Ilse Smid" or another stereotypically Dutch name, claiming to be from Microsoft Windows, and that my computer had alerted them that it had a virus... These scam calls all came from nonexistent Dutch phone numbers.
The funniest one is when my fixed line provider (let's call it P) calls me on my mobile phone (which is another provider) and ask me if I'm one oh their (P) customer :-) (the explanation is that the mobile/fixed businesses are separated to avoid monopoly and, since they can't share customer data ('cos of data protection rules), they have to ask them again :-))